Klaus R. Dittrich Advances in Object-Oriented Database Systems, 2nd International Workshop on Object-Oriented Database Systems, Bad Münster am Stein-Ebernburg, FRG, September 27-30, 1988, Proceedings OODBS Lecture Notes in Computer Science 334 Springer 1988 3-540-50345-5 db/conf/oodbs/oodbs88.html