S. Riegel, F. Mellender, and A. Straw, "Integration of database management with anobject-oriented programming language" pp317-322

Dittrich, K.; Dayal, U.; Buchmann, A. (1991) Dittrich, K.; Dayal, U.; Buchmann, A. (eds.): On Object-Oriented Database Systems. Topics in Information Systems LNCS 334, Springer-Verlag, 1988  

Languages mentioned Alltalk {1988} Smalltalk with persistency