Groups are not always the same. - Kalle Lyytinen; Petri Maaranen; Juha Knuuttila (Comput. Support. Cooperative Work., 1994)

Designing meeting support systems in a user-centered manner: the case of the Helsinki prototype system. - Petri Maaranen; Kalle Lyytinen (COOCS, 1995)

GroupVideo-distributed EMS for small groups. - Petri Maaranen (HICSS (4), 1995)