Minglin Deng Fengli Zhang Spatial Temporal Queries and Triggers for Managing Moving Objects. 88-97 2002 conf/adbis/2002l ADBIS Research Communications http://www.dcs.elf.stuba.sk/adbis2002/bin/abstracts1.htm#deng db/conf/adbis/adbis2002l.html#DengZ02