Entering Text with a Four-Button Device.

Kumiko Tanaka-Ishii Yusuke Inutsuka Masato Takeichi Entering Text with a Four-Button Device. 2002 conf/coling/2002 COLING http://aclweb.org/anthology/C02-1149 db/conf/coling/coling2002.html#Tanaka-IshiiIT02