Wendy E. Mackay Caroline Appert Michel Beaudouin-Lafon Olivier Chapuis Yangzhou Du Jean-Daniel Fekete Yves Guiard Touchstone: exploratory design of experiments. 1425-1434 2007 conf/chi/2007 CHI http://doi.acm.org/10.1145/1240624.1240840 db/conf/chi/chi2007.html#MackayABCDFG07