O. M. González María Jesús Verdú Yannis A. Dimitriadis María T. Blasco J. L. Barrios J. López Pen-Computing and Groupware: A Chance to Improve Collaborative Writing. 463-466 1997 conf/hci/1997-2 HCI (2) db/conf/hci/hci1997-2.html#GonzalezVDBBL97