Thomas Kirsche Richard Lenz Horst Lührsen Klaus Meyer-Wegener Hartmut Wedekind Martin Bever Ulrich Schäffer Claus Schottmüller Communication support for cooperative work. 594-602 1993 16 Computer Communications 9 http://dx.doi.org/10.1016/0140-3664(93)90029-R db/journals/comcom/comcom16.html#KirscheLLMWBSS93