Jim Melton Jonathan Bauer Krishna G. Kulkarni Object ADTs (with improvements for Value ADTs) ANSI X3H2 DBL:ARL-029 X3H2-91-083rev1 April 1991 db/systems/sqlPapers.html#X3H2-91-083rev1 SQL/X3H2-91-083rev1.pdf db/systems/X3H2-91-083rev1.html