conf/sigmod/83 Gad Ariav James Clifford Matthias Jarke Time and Databases. 243-245 1983 SIGMOD Conference db/conf/sigmod/sigmod83.html#AriavCJ83 SIGMOD83/P243.PDF http://doi.acm.org/10.1145/582192.582232 ... journals/sigmod/BolourADW82 ... journals/tods/CliffordW83 ... conf/vldb/AntonellisZ81 conf/sigmod/HammerM78 ... conf/er/Klopprogge81 conf/sigmod/RollandR82