Trevor Darrell Konrad Tollmar Frank Bentley Neal Checka Louis-Philippe Morency Ali Rahimi Alice Oh Face-Responsive Interfaces: From Direct Manipulation to Perceptive Presence. 135-151 2002 conf/huc/2002 Ubicomp http://link.springer.de/link/service/series/0558/bibs/2498/24980135.htm db/conf/huc/ubicomp2002.html#DarrellTBCMRO02