Computer Assisted Learning 3rd International Conference, ICCAL '90, Hagen, FRG, June 11-13, 1990, Proceedings Norrie Douglas H. Heftet / 1990 / Engelsk
Geographic Database Management Systems Workshop Proceedings Capri, Italy, May 1991 Gambosi Giorgio Heftet / 2011 / Engelsk
Computer Science in Perspective Essays Dedicated to Thomas Ottmann Klein, Rolf Heftet / 2003 / Engelsk
Geographic Database Management Systems Workshop Proceedings, Capri, Italy, May 1991 Gambosi Giorgio Innbundet / 1992 / Engelsk
