The following proceedings' contents have been added to the bibliography:

BNCOD	1988 1989 1990 1991 1992

DBPL	1991 1993

DOOD    1991

EDBT	1990

ICDE	1993

RIDE	1994

RIDS    1995

SIGMOD	1982 1983 1986 1987 1988 1990 1991 1992

VLDB	1984 1990 1991 1992 1993 1994



And:

Proc. International Workshop on Object-Oriented Database Systems (1986)
Proc. 2nd International Conference on Expert Database Systems (1988)

