Stanley Y. W. Su Hsu Chang George P. Copeland Paul Fisher Eugene I. Lowenthal Stewart A. Schuster Database machines and some issues on DBMS standards. 191-208 1980 AFIPS National Computer Conference http://doi.acm.org/10.1145/1500518.1500549 conf/afips/1980 db/conf/afips/ncc80.html#SuCCFLS80