Ole Oren Integrity Constraints in the Conceptual Schema Language SYSDOC. 288-294 1985 ER db/conf/er/er85.html#Oren85 conf/er/85 er85/ER85-P288.pdf ... ... journals/is/Brodie80 ... conf/vldb/EswaranC75 journals/cj/Frost83 ... journals/cacm/Iverson80 journals/is/Kobayashi84 conf/vldb/Lafue82 conf/er/LenzeriniS83 conf/er/Nakano83 ... conf/vldb/OrenA79 journals/tods/SmithS77 ... conf/sigmod/Stonebraker75 conf/er/TabourierN81