conf/sigmod/95 Alejandro P. Buchmann Alin Deutsch Jürgen Zimmermann M. Higa The REACH Active OODBMS. 476 1995 conf/sigmod/95 conf/sigmod/95 SIGMOD Conference db/conf/sigmod/sigmod95.html#BuchmannDZH95 http://doi.acm.org/10.1145/223784.223889 SIGMOD95/P476.PDF conf/icde/BuchmannZBW95 journals/computer/WellsBT92