Whalen, T. ., Ha, V. ., Inkpen, K. M., Mandryk, R. L., Scott, S. D., & Hancock, M. S. (2004). Direct Intentions: The Effects of Input Devices on Collaboration around a Tabletop Display. Retrieved from http://www.cs.dal.ca/research/techreports/2004/CS-2004-17.shtml