J. Stewart, B. Bederson, and A. Druin. CHI '99: Proceedings of the SIGCHI conference on Human factors in computing systems, page 286--293. New York, NY, USA, ACM, (1999)
J. Stewart, B. Bederson, and A. Druin. CHI '99: Proceedings of the SIGCHI conference on Human factors in
computing systems, page 286--293. New York, NY, USA, ACM, (1999)