Integrating gesture and snapping into a user interface toolkit.

Tyson R. Henry Scott E. Hudson Gary L. Newell Integrating gesture and snapping into a user interface toolkit. 112-122 1990 UIST http://doi.acm.org/10.1145/97924.97938 conf/uist/1990 db/conf/uist/uist1990.html#HenryHN90