conf/sigmod/92 Rowland R. Johnson Mandy Goldner Mitch Lee Keith McKay Robert Shectman John Woodruff USD - A Database Management System for Scientific Research. 4 1992 SIGMOD Conference db/conf/sigmod/sigmod92.html#JohnsonGLMSW92 http://doi.acm.org/10.1145/130283.130286 db/conf/sigmod/JohnsonGLMSW92.html SIGMOD92/P004.PDF