Leopoldo E. Bertossi Javier Pinto Specifying Active Rules for Database Maintenance. 112-129 http://link.springer.de/link/service/series/0558/bibs/1773/17730112.htm 1999 conf/fmldo/1999lncs FMLDO - Selected Papers db/conf/fmldo/fmldoLNCS99.html#BertossiP99a