Items where Author is "Heller, Ben"
Number of items: 79.
SCONCE, Emma, HELLER, Ben, MADEN-WILKINSON, Tom and HAMILTON, Nick
(2024).
Examining the effect of verbal feedback vs. real-time software feedback on kinetic and kinematic metrics of the Nordic hamstring exercise.
Sport Sciences for Health.
[Article]
JONES, Ben, HELLER, Ben, VAN GELDER, Linda, BARNES, Andrew, REEVES, Joanna and WHEAT, Jonathan
(2024).
Running Gait Complexity During an Overground, Mass-Participation Five-Kilometre Run.
Sensors, 24 (22): 7252.
[Article]
D'ANDREA, Francesca, TAYLOR, Paul, YANG, Kai and HELLER, Ben
(2023).
Can inertial measurement unit sensors evaluate foot kinematics in drop foot patients using functional electrical stimulation?
Frontiers in Human Neuroscience, 17.
[Article]
BULLAS, Alice, CHOPPIN, Simon, HELLER, Ben and WHEAT, Jonathan
(2022).
Comparison of Complex and Simple Anthropometrics in the Descriptive Anthropometric Assessment of Male Cyclists.
International Journal of Kinanthropometry, 2 (2), 13-27.
[Article]
BULLAS, Alice, HELLER, Ben, CHOPPIN, Simon and WHEAT, Jonathan
(2022).
Sensitivity of Anthropometrics in the Longitudinal Assessment of Mountain Bike Cyclists [Abstract only].
International Journal of Kinanthropometry, 2 (S1), p. 1.
[Article]
BULLAS, Alice, CHOPPIN, Simon, HELLER, Ben and WHEAT, Jonathan
(2022).
Validation of A 3DMDbody5 System for The Extraction of Surface Anthropometrics [Abstract only].
International Journal of Kinanthropometry, 2 (S1), p. 3.
[Article]
CHIU, Chuang-Yuan, DUNN, Marcus, HELLER, Ben, CHURCHILL, Sarah and MADEN-WILKINSON, Tom
(2022).
Modification and refinement of three-dimensional reconstruction to estimate body volume from a simulated single-camera image.
Obesity Science and Practice.
[Article]
HAAKE, Steve, HELLER, Ben, SCHNEIDER, Paul, SMITH, Rob and GREEN, Geoff
(2021).
The influence of neighbourhood equity on parkrunners in a British city.
Health Promotion International.
[Article]
SCONCE, Emma, HELLER, Ben, MADEN-WILKINSON, Tom and HAMILTON, Nick
(2021).
Agreement between methods and terminology used to assess the kinematics of the Nordic hamstring exercise.
Journal of Sports Sciences.
[Article]
ANDERSON, Emma, STONE, Joseph, DUNN, Marcus and HELLER, Ben
(2021).
Coach Approaches to Practice Design in Performance Tennis.
International Journal of Sports Science and Coaching.
[Article]
CURTIS, David, HELLER, Ben and SENIOR, Terry
(2021).
Methods for estimating moment of inertia of cricket bats.
Sports Engineering, 24, p. 11.
[Article]
SCONCE, Emma, HELLER, Ben, MADEN-WILKINSON, Thomas and HAMILTON, Nick
(2021).
Development of a novel Nordic hamstring exercise device to measure and modify the knee flexors’ torque-length relationship.
Frontiers in Sport and Active Living, 3, p. 629606.
[Article]
ROYLE, Alan, HELLER, Ben and DUNN, Marcus
(2021).
Do children and adolescents with cerebral palsy walk with reduced dynamic stability compared to their typically developing peers? A systematic review.
APCP Journal, 12 (2), 14-32.
[Article]
QUIRK, Helen, HELLER, Ben and WRIGHT, Neil
(2020).
Feasibility and acceptability of physical activity monitoring as an educational tool in the management of pediatric type 1 diabetes.
Canadian Journal of Diabetes, 44 (8), 688-696.
[Article]
CHOPPIN, Simon, CLARKSON, Sean, BULLAS, Alice, THELWELL, Michael, HELLER, Ben and WHEAT, Jon
(2020).
Anatomical and principal axes are not aligned in the torso: considerations for users of geometric modelling methods.
Journal of Biomechanics, p. 110151.
[Article]
MUNOZ-ORGANERO, Mario, POWELL, Lauren, HELLER, Ben, HARPIN, Val and PARKER, Jack
(2019).
Using recurrent neural networks to compare movement patterns in ADHD and normally developing children based on acceleration signals from the wrist and ankle.
Sensors, 19 (13), p. 2935.
[Article]
CABALLERO, Carla, DAVIDS, Keith, HELLER, Ben, WHEAT, Jonathan and MORENO, Francisco J
(2019).
Movement variability emerges in gait as adaptation to task constraints in dynamic environments.
Gait and posture, 70, 1-5.
[Article]
BRAYNE, Leona, BARNES, Andrew, HELLER, Ben and WHEAT, Jonathan
(2018).
Using a wireless consumer accelerometer to measure tibial acceleration during running : agreement with a skin mounted sensor.
Sports Engineering, 21 (4), 487-491.
[Article]
MUÑOZ-ORGANERO, Mario, POWELL, Lauren, HELLER, Ben, HARPIN, Val and PARKER, Jack
(2018).
Automatic extraction and detection of characteristic movement patterns in children with ADHD Based on a convolutional neural network (CNN) and acceleration images.
Sensors, 18 (11), p. 3924.
[Article]
VAN GELDER, Linda, BARNES, Andrew, WHEAT, Jonathan and HELLER, Ben
(2018).
The use of biofeedback for gait retraining: A mapping review.
Clinical Biomechanics, 59, 159-166.
[Article]
HELLER, Ben, MAZUMDAR, Suvodeep and CIRAVEGNA, Fabio
(2018).
Large scale, long-term, high granularity measurement of active travel using smartphones apps.
Proceedings, 2 (6), p. 293.
[Article]
VAN GELDER, Linda M.A., BARNES, Andrew, WHEAT, Jonathan and HELLER, Ben
(2018).
Characterizing the learning effect in response to biofeedback aimed at reducing tibial acceleration during running.
Proceedings, 2 (6), p. 200.
[Article]
SOLOMONS, Cassandra, SLOVAK, Martin, HELLER, Ben and BARKER, Anthony
(2017).
Reducing the sensation of electrical stimulation with dry electrodes by using an array of constant current sources.
Medical Engineering & Physics, 51, 91-95.
[Article]
FULLERTON, Elliott, HELLER, Ben and MUNOZ-ORGANERO, Mario
(2017).
Recognising human activity in free-living using multiple body-worn accelerometers.
IEEE Sensors Journal, 17 (16), 5290-5297.
[Article]
HEXT, Andrew, HELLER, Ben, KELLEY, John and GOODWILL, Simon
(2017).
Relay exchanges in elite short track speed skating.
European Journal of Sport Science, 17 (5), 503-510.
[Article]
FOSTER, Leon, HELLER, Ben, WILLIAMS, Alan, DUNN, Marcus, CURTIS, David and GOODWILL, Simon
(2016).
Development of smart inner city recreational facilities to encourage active living.
In: GARCIA, Carmelo R., CABALLERO-GIL, Pino, BURMESTER, Mike and QUESADA-ARENCIBIA, Alexis, (eds.)
Ubiquitous computing and ambient intelligence : 10th International Conference, UCAmI 2016, San Bartolomé de Tirajana, Gran Canaria, Spain, November 29 – December 2, 2016,.
Lecture Notes in Computer Science, II
(10070).
Springer, 458-468.
[Book Section]
BULLAS, Alice, CHOPPIN, Simon, HELLER, Ben and WHEAT, Jonathan
(2016).
ISAK and digital 3D body measurement: A longitudinal case study from elite cycling.
In: World Conference on Kinanthropometry and Body Composition ISAK-UADY, Merida, Mexico, 31 Oct 2016 - 2 Nov 2016.
215-217.
(Unpublished)
[Conference or Workshop Item]
BULLAS, Alice, HELLER, Ben, CHOPPIN, Simon and WHEAT, Jonathan
(2016).
The relationship between peak power and leg size in mountain bike cyclists.
In: World Conference on Kinanthropometry and Body Composition ISAK-UADY 2016, Mexico, 31 October - 2 November 2016.
(Unpublished)
[Conference or Workshop Item]
KENNEY, Laurence, HELLER, Ben, BARKER, Anthony T., REEVES, Mark L., HEALEY, Jamie, GOOD, Timothy R., COOPER, Glen, SHA, Ning, PRENTON, Sarah, LIU, Anmin and HOWARD, David
(2016).
A review of the design and clinical evaluation of the ShefStim array-based functional electrical stimulation system.
Medical Engineering & Physics, 38 (11), 1159-1165.
[Article]
HEXT, Andrew, HELLER, Ben, KELLEY, Jon and GOODWILL, Simon
(2016).
Measuring straight time in elite short track speed skating relays.
In: The Engineering of Sport 11, Delft, The Netherlands, 11-14 Jul 2016.
(Unpublished)
[Conference or Workshop Item]
HEXT, Andrew, HELLER, Ben, KELLEY, John and GOODWILL, Simon
(2016).
Measuring straight time in elite short track speed skating relays.
Procedia Engineering, 147, 622-626.
[Article]
BULLAS, Alice, HELLER, Ben, CHOPPIN, Simon and WHEAT, Jonathan
(2016).
The effect of distance between anthropometric measures in geometric models of thigh volume.
In: BASES Biomechanics Interest Group Conference, Liverpoool.
Liverpool John Moores University.
(Unpublished)
[Conference or Workshop Item]
BULLAS, Alice, CHOPPIN, Simon, HELLER, Ben and WHEAT, Jonathan
(2016).
Validity and repeatability of a depth camera based surface imaging system for thigh volume measurement.
Journal of Sports Sciences, 34 (20), 1998-2004.
[Article]
SLOVAK, Martin, CHINDO, Joseph, NAIR, Krishnan Padmakumari Sivaraman, REEVES, Mark L., HELLER, Ben and BARKER, Anthony T.
(2016).
Sensory barrage stimulation in the treatment of elbow spasticity: a crossover double blind randomized pilot trial.
Neuromodulation: Technology at the Neural Interface, 19 (2), 220-226.
[Article]
DOMONE, Sarah, LAWRENCE, Daniel, HELLER, Ben, HENDRA, Tim, MAWSON, Sue and WHEAT, Jonathan
(2016).
Optimal fall indicators for slip induced falls on a cross-slope.
Ergonomics, 59 (8), 1089-1099.
[Article]
LAWRENCE, Daniel, DOMONE, Sarah, HELLER, Ben, HENDRA, T, MAWSON, Sue and WHEAT, Jonathan
(2015).
Gait adaptations to awareness and experience of a slip when walking on a cross-slope.
Gait & Posture, 42 (4), 575-579.
[Article]
CLARKSON, Sean, WHEAT, Jonathan, HELLER, Ben and CHOPPIN, Simon
(2015).
Assessment of a Microsoft Kinect-based 3D scanning system for taking body segment girth measurements : a comparison to ISAK and ISO standards.
Journal of Sports Sciences, 34 (11), 1006-1014.
[Article]
BARNES, Andrew, PAYA, Javier Gamez, CASTELLI, Andrea and HELLER, Ben
(2015).
Foot strike patterns in runners wearing floating heel, minimalist and conventional footwear.
33rd International conference on biomechanics in sports, 2015, 519-522.
[Article]
BRAYNE, Leona, BARNES, Andrew, HELLER, Ben and WHEAT, Jonathan
(2015).
Using a wireless inertial sensor to measure tibial shock during running : agreement with a skin mounted sensor.
In: 33rd International Symposium on Biomechanics in Sports, Poitiers, France, 29 June - 3 July 2015.
[Conference or Workshop Item]
EVERSON-HOCK, Emma S., GREEN, Mark A., GOYDER, Elizabeth C., COPELAND, Robert J., TILL, Simon H., HELLER, Ben and HART, Ollie
(2015).
Reducing the impact of physical inactivity: evidence to support the case for targeting people with chronic mental and physical conditions.
Journal of Public Health, 37 (2), 1-9.
[Article]
STORM, F, HELLER, Ben and MAZZA, C
(2015).
Step detection and activity recognition accuracy of seven physical activity monitors.
PLOS ONE, 10 (3), e0118723.
[Article]
WILLIAMSON, T, KENNEY, L, BARKER, A T, COOPER, G, GOOD, T, HEALEY, J, HELLER, Ben, HOWARD, D, MATTHEWS, M, PRENTON, S, RYAN, J and SMITH, Christine
(2015).
Enhancing public involvement in assistive technology design research.
Disability and Rehabilitation. Assistive Technology, 10 (3), 258-265.
[Article]
KENNEY, Laurence P., HELLER, Ben, BARKER, Anthony T., REEVES, Mark L., HEALEY, T. Jamie, GOOD, Timothy R., COOPER, Glen, SHA, Ning, PRENTON, Sarah and HOWARD, David
(2015).
The design, development and evaluation of an array-based FES system with automated setup for the correction of drop foot.
IFAC Papers OnLine, 48 (20), 309-314.
[Article]
CLARKSON, Sean, WHEAT, Jonathan, HELLER, Ben and CHOPPIN, Simon
(2014).
Assessing the suitability of the Microsoft Kinect for calculating person specific body segment parameters.
In: 4th IEEE Workshop on Consumer Depth Cameras for Computer Vision, Zurich, Switzerland, 6th Septmber 2014.
[Conference or Workshop Item]
JARCHI, D., WONG, C., KWASNICKI, R.M., HELLER, Ben, TEW, G.A. and YANG, G.Z.
(2014).
Gait parameter estimation from a miniaturized ear-worn sensor using singular spectrum analysis and longest common subsequence.
IEEE Transactions on Biomedical Engineering, 61 (4), 1261-1273.
[Article]
REED, Heath, LEITAO, Roxanne, HELLER, Ben and DEARDEN, Andrew
(2014).
Innovage: social innovation 'iStep'.
In: 2014 National MND Conference.
[Conference or Workshop Item]
BULLAS, Alice, CHOPPIN, Simon, HELLER, Ben, CLARKSON, Sean and WHEAT, Jonathan
(2014).
Kinanthropometry application of depth camera based 3D scanning systems in cycling : repeatability and agreement with manual methods.
In:
5th International Conference on 3D Body Scanning Technologies, Lugano, Switzerland, 21-22 October 2014.
Hometrica Consulting, 290-298.
[Book Section]
CURTIS, David, HURT, Georgina and HELLER, Ben
(2014).
The reliability of a tapping test as an indicator of cricket bat performance.
Procedia Engineering, 72, 666-671.
[Article]
NEBAS, Tim and HELLER, Ben
(2014).
A smartphone based system for kite and board measurements in kitesurfing.
Procedia Engineering, 72, 477-482.
[Article]
CLARKSON, Sean, WHEAT, Jonathan, HELLER, Ben, WEBSTER, J and CHOPPIN, Simon
(2013).
Distortion correction of depth data from consumer depth cameras.
In: 3D Body Scanning Conference, Los Angeles, November.
[Conference or Workshop Item]
HELLER, Ben, CLARKE, Alison J., GOOD, Timothy R., HEALEY, T. Jamie, NAIR, Siva, PRATT, Emma J., REEVES, Mark L., VAN DER MEULEN, Jill M. and BARKER, Anthony T.
(2013).
Automated setup of functional electrical stimulation for drop foot using a novel 64 channel prototype stimulator and electrode array : results from a gait-lab based study.
Medical Engineering and Physics, 35 (1), 74-81.
[Article]
DOMONE, Sarah, WHEAT, Jonathan, CHOPPIN, Simon, HAMILTON, Nick and HELLER, Ben
(2012).
Wavelet based de-noising of non-stationary kinematic signals.
In: 30th Annual Conference of Biomechanics in Sports, Melbourne, Australia, 2-6 July 2012.
[Conference or Workshop Item]
GENT, Susannah, BURTON, Maria and HELLER, Ben
(2012).
Physiofun - Engineering for Life.
[Image]
(Unpublished)
[Image]
YOXALL, Alaster, HELLER, Ben and CHAMBERLAIN, Paul
(2011).
Oom Bop Bop Good Vibrations: the use of sensory feedback to create motion inhibition.
In: Include 2011, Royal College of Art, London, 18-20 April 2011.
[Conference or Workshop Item]
SEALS, E J, WHEAT, Jonathan, HELLER, Ben and MAWSON, Sue
(2010).
Between-session reliability of measuring whole-body reaching kinematics.
In: BASES 2010 Annual Student Conference, Aberystwyth, 31 March - 1 April 2010.
[Conference or Workshop Item]
CURTIS, D and HELLER, Ben
(2010).
Elastic modulus and related properties.
In: BARTLETT, Roger, GRATTON, Chris and ROLF, Christer G, (eds.)
Encyclopedia of International Sports Studies.
Routledge.
[Book Section]
GOMEZ, J.E. and HELLER, Ben
(2008).
Detecting Location using Sensors Based on the 802:15:4 Wireless Standard.
In: ESTIVALET, Margaret and BRISSON, Pierre, (eds.)
The Engineering of Sport 7.
Springer.
[Book Section]
SHA, Ning, KENNEY, Laurence P. J., HELLER, Ben, BARKER, Anthony T., HOWARD, David and MOATAMEDI, Moji
(2008).
A finite element model to identify electrode influence on current distribution in the skin.
Artificial organs, 32 (8), 639-643.
[Article]
GRAHAM, Lorraine E., DATTA, Dipak, HELLER, Ben, HOWITT, John and PROS, Dip
(2007).
A comparative student of conventional and energy-storing prosthetic feet in high-functioning transfemoral amputees.
Archives of physical medicine and rehabilitation, 88 (6), 801-806.
[Article]
SHA, N, KENNEY, LPJ, HELLER, Ben, BARKER, AT and MOATAMEDI, M
(2007).
An FE model to identify electrode influence on current distribution in the skin.
In: 9th Vienna International Workshop on Functional Electrical Stimulation, 19-22 September, Vienna, Austria, 19-22 September 2007.
[Conference or Workshop Item]
SCOTT, E, MAWSON, Sue and HELLER, Ben
(2006).
Functional electrical stimulation for the enhancement of gait in subjects with incomplete spinal cord injury.
In: 4th World Congress for Neuro-rehabilitation, Hong Kong, 12-16 February 2006.
[Conference or Workshop Item]
HELLER, Ben
(2006).
Amplification and signal conditioning.
In: BARTLETT, Roger, GRATTON, Chris and ROLF, Christer G., (eds.)
Encyclopaedia of International Sports Studies.
Routledge.
[Book Section]
WHEAT, Jonathan, FLEMING, Reuben, BURTON, Maria, PENDERS, Jacques, CHOPPIN, Simon and HELLER, Ben
(2006).
Establishing the accuracy and feasibility of Microsoft Kinect in various multi-disciplinary contexts.
Project Report.
Sheffield Hallam University for EPSRC Engineering for Life.
[Monograph]
SHA, N, HELLER, Ben and BARKER, AT
(2004).
3D modelling of a hydro gel sheet - electrode array combination for surface functional electrical stimulation.
In: 9th IFESS Annual International Conference, Bournemouth,, 6-9 September 2004.
(Unpublished)
[Conference or Workshop Item]
HELLER, Ben, BAKER, T, SHA, N, NEWMAN, J and HARRON, E
(2003).
Improved control of ankle movement using an array of mini-electrodes.
In: FES User Day Conference, Birmingham UK, December 2003.
(Unpublished)
[Conference or Workshop Item]
HELLER, Ben and TAYLOR, P
(2002).
A new family of programmable stimulators.
In: FESnet Conference, Glasgow, Scotland, September 2002.
(Unpublished)
[Conference or Workshop Item]
BIERING-SORENSEN, F, MAXWELL, DJ, HELLER, Ben, MARQUES, AM, CLOOSTERMANS, JTMM and HERMENS, HJ
(2000).
Surface funcational electrical stimulation (FES) for walking in complete spinal cord lesioned (SCL) individuals.
In: 5th Annual Conference of the International Funcational Electrical Stimulatio Society, Aalborg, Denmark, 18-20 June 2000.
(Unpublished)
[Conference or Workshop Item]
GHAROONI, S, TOKHI, O and HELLER, Ben
(2000).
The use of elastic element in a hybrid orthosis for swing phase generation in orthotic gait.
In: 5th Annual Conference of the International Functional Electrical Stimulation Society, Aalborg, Denmark, 18-20 June 2000.
(Unpublished)
[Conference or Workshop Item]
MAYAGIOTIA, R E, DUNTSTON, S C M and HELLER, Ben
(1999).
Evaluation of balance during activities of daily living.
In: BLANCHARD, Susan M., ECKSTEIN, Eugene C., FOUKE, Janie M., NEREM, Robert M. and YOGANATHAN, Ajit P., (eds.)
Proceedings of the first joint BMES/EMBS conference.
Piscataway, NJ, IEEE EMB, p. 520.
[Book Section]
GRANAT, MH, HERMENS, HJ, BAARDMAN, G, HELLER, Ben, BIERING-SORENSEN, F, GARCIA, F and VELTINK, PH
(1997).
Clinical rehabilitation using electrical stimulation via telematics (CREST).
In: POPOVIC, Dejan, (ed.)
Proceedings of the Second Annual Conference of the International Functional Electrical Stimulation Society (IFESS '97) and fifth triennial conference Neural prostheses: motor systems 5 (NP '97) : Burnaby, British Columbia, Canada, August 1997.
Conference Organizing Committee and IFESS.
[Book Section]
HELLER, Ben
(1997).
A visual programming language for stimulators.
In: 5th IPEM Clinical Functional Electrical Stimulation Meeting, Salisbury, 13-14 March 1997.
[Conference or Workshop Item]
HERMENS, HJ, BAARDMAN, G, GRANAT, NH, HELLER, Ben, BIERING-SORENSEN, F, GARCIA, FJ and VELTINK, PH
(1997).
Clinical rehabilitation using electrical stimulation via telematics (CREST) an EU programme for improvement of gait of incomplete paraplegics.
In: 5th IPEM Clinical Functional Electrical Stimulation Meeting, Salisbury, 13-14 March 1997.
[Conference or Workshop Item]
HELLER, Ben, GRANAT, MH, HERMENS, JH, BAARDMAN, HJ, BIERING-SORENSEN, F and MARQUES, AM
(1997).
Clinical rehabilitation using electrical stimulator via telematics (CREST).
In: POPOVIC, Dejan, (ed.)
Proceedings of the Second Annual Conference of the International Functional Electrical Stimulation Society (IFESS '97) and fifth triennial conference Neural prostheses: motor systems 5 (NP '97) : Burnaby, British Columbia, Canada, August 1997.
Conference Organizing Committee and IFESS.
[Book Section]
DATTA, D, HOWITT, J, HELLER, Ben and BILLINGHAM, G
(1997).
Cognitive demands and dynamic cosmesis of walking of amputees using intelligent knee : a comparative evaluation.
In: UEDA, Satoshi, NAKAMURA, Ryuichi and ISHIGAMA, Shigenobu, (eds.)
The 8th World Congress of the International Rehabilitation Medicine Association : IRMA 8. : Kyoto (Japan), August 31- September 4, 1997.
Monduzzi International proceedings division.
[Book Section]
GHAROONI, S, HELLER, Ben and TOKHI, MO
(1997).
Production of hip and knee flexion in the swing phase by use of a new hybrid orthosis.
In: POPOVIC, Dejan, (ed.)
Proceedings of the Second Annual Conference of the International Functional Electrical Stimulation Society (IFESS '97) and fifth triennial conference Neural prostheses: motor systems 5 (NP '97) : Burnaby, British Columbia, Canada, August 1997.
Conference Organizing Committee and IFESS.
[Book Section]
LOUISON, K, WILSON, AJ and HELLER, Ben
(1997).
Strategies for the improvement of stability in FES elicited standing.
In: 5th IPEM Clinical Functional Electrical Stimulation Meeting, Salisbury, 13-14 March 1997.
[Conference or Workshop Item]
GHAROONI, S, HELLER, Ben and TOKHI, O
(1997).
A novel technique for generating hip flexion during the swing phase of gait.
In: 5th IPEM Clinical Functional Electrical Stimulation Meeting, Salisbury, 13-14 March 1997.
[Conference or Workshop Item]
HELLER, Ben and GRANAT, MH
(1992).
The use of machine learning techniques to induce control rules for FES assisted gait.
In: Biological Engineering Society International Symposium on Therapeutic Stimulation, Liverpool, UK, August 1992.
[Conference or Workshop Item]
HELLER, Ben, ANDREWS, B.J. and RIIJKHOFF, N.J.M.
(1991).
Inductive cloning of a state model for normal gait.
In: NAGEL, Joachim H. and SMITH, William M., (eds.)
Proceedings of the Annual International Conferen of hte IEEE Engineering in Medicine and Biology Society. Part 2/5.
Piscataway, NJ, IEEE, 918-919.
[Book Section]