Kerridge, Jon, Armitage, Alistair, Binnie, David, Lei, Lucy and Sumpter, Neil (2005) Using low cost infrared detectors to monitor movement of pedestrians: initial findings. Transportation Research Record, 1878 (1). pp. 11-18. ISSN 0361 1981

Kerridge, Jon, Armitage, Alistair, Binnie, David, Lei, Lucy and Sumpter, Neil (2004) Monitoring the movement of pedestrians using low-cost infrared detectors: initial findings. Transportation Research Record, 1878. pp. 11-18. ISSN 0361-1981

Kerridge, Jon, Armitage, Alistair, Binnie, David, Lei, Lucy and Sumpter, Neil (2003) Using low-cost infrared detectors to monitor movement of pedestrians. In: Sensors and their applications XII. Sensors and their applications . IOP Press, pp. 143-149. ISBN 0750309784