ICDT '88 2nd International Conference on Database Theory, Bruges, Belgium, August 31-September 2, 1988. Proceedings Gyssens Marc Heftet / 1988 / Engelsk
MFDBS 87 1st Symposium on Mathematical Fundamentals of Database Systems, Dresden, GDR, January 19-23, 1987. Proceedings Biskup Joachim Heftet / 1988 / Engelsk
