PENCACOLAS: Groupware for Learning. - O. M. González; María Jesús Verdú; Yannis A. Dimitriadis; César A. Osuna; Carlos Angel Iglesias; J. López (CRIWG, 1997)

Pen-Computing and Groupware: A Chance to Improve Collaborative Writing. - O. M. González; María Jesús Verdú; Yannis A. Dimitriadis; María T. Blasco; J. L. Barrios; J. López (HCI (2), 1997)

Integrating Cooperative Learning in a Virtual Class: A Case Study. - O. M. González; Yannis A. Dimitriadis; María Jesús Verdú; César A. Osuna; Ana Grande; María T. Blasco; J. L. Barrios (Teleteaching, 1998)