SLAP widgets: bridging the gap between virtual and physical controls on tabletops. - Malte Weiss; Roger Jennings; Ramsin Khoshabeh; Jan O. Borchers; Julie Wagner; Yvonne Jansen; James D. Hollan (CHI Extended Abstracts, 2009)

SLAPbook: tangible widgets on multi-touch tables in groupware environments. - Malte Weiss; Julie Wagner; Roger Jennings; Yvonne Jansen; Ramsin Khoshabeh; James D. Hollan; Jan O. Borchers (TEI, 2009)