James E. Gain. Using poll sheets and computer vision as an inexpensive alternative to clickers. In John McNeill, Karen L. Bradshaw, Philip Machanick, Mosiuoa Tsietsi, editors, 2013 South African Institute for Computer Scientists and Information Technologists, SAICSIT '13, East London, South Africa, October 7-9, 2013. pages 60-63, ACM, 2013. [doi]
Abstract is missing.