Colin G. Butler

Tool-based direct manipulative environments

Thomas E. Horton, John M. Daughtry, Robert St. Amant, 2010 .

HabilisDraw DT: a bimanual tool-based direct manipulation drawing environment

Robert St. Amant, Colin G. Butler, 2004, CHI EA '04.

Demonstration: Two-handed interaction in a tool-based environment

Robert St. Amant, Colin G. Butler, 2003 .