Few-key text entry revisited: mnemonic gestures on four keys.

Jacob O. Wobbrock Brad A. Myers Brandon Rothrock Few-key text entry revisited: mnemonic gestures on four keys. 489-492 2006 conf/chi/2006 CHI http://doi.acm.org/10.1145/1124772.1124846 db/conf/chi/chi2006.html#WobbrockMR06