Advances in Spatial Databases 2nd Symposium, SSD '91, Zurich, Switzerland, August 28-30, 1991. Proceedings Günther, Oliver Heftet / 1991 / Engelsk
Peer-to-Peer, Grid, and Service-Orientation in Digital Library Architectures 6th Thematic Workshop of the EU Network of Excellence DELOS, Cagliari, Italy, June 24-25, 2004, Revised Selected Papers Türker, Can Heftet / 2005 / Engelsk
Interoperating Geographic Information Systems Second International Conference, INTEROP'99, Zurich, Switzerland, March 10-12, 1999 Proceedings Vckovski, Andrej Heftet / 1999 / Engelsk
IGIS '94: Geographic Information Systems International Workshop on Advanced Research in Geographic Information Systems, Monte Verita, Ascona, Switzerland, February 28 - March 4, 1994. Proceedings Nievergelt, Jürg Heftet / 1994 / Engelsk
Advances in Database Technology - EDBT '98 6th International Conference on Extending Database Technology, Valencia, Spain, March 23-27, 1998. Schek, Hans-Jörg Heftet / 1998 / Engelsk
