Thomas Kirsche Richard Lenz Horst Lührsen Klaus Meyer-Wegener Hartmut Wedekind Martin Bever Ulrich Schäffer Claus Schottmüller CoDraft: An Object-Based Drafting Tool on Top of Group Communication Services. 521-526 1993 GI Jahrestagung db/conf/gi/gi93.html#KirscheLLMWBSS93