MFDBS 89 2nd Symposium on Mathematical Fundamentals of Database Systems, Visegrad, Hungary, June 26-30, 1989. Proceedings Demetrovics Janos Heftet / 1989 / Engelsk
Fundamentals of Computation Theory International Conference FCT '89, Szeged, Hungary, August 21-25, 1989. Proceedings Csirik Janos Heftet / 1989 / Engelsk
Advances in Databases and Information Systems 8th East European Conference, ADBIS 2004, Budapest, Hungary, September 22-25, 2004, Proceedings Gottlob Georg Heftet / 2004 / Engelsk
MFDBS 91 3rd Symposium on Mathematical Fundamentals of Database and Knowledge Base Systems, Rostock, Germany, May 6-9, 1991 Thalheim Bernhard Heftet / 1991 / Engelsk
MFDBS 87 1st Symposium on Mathematical Fundamentals of Database Systems, Dresden, GDR, January 19-23, 1987. Proceedings Biskup Joachim Heftet / 1988 / Engelsk
