Stephen Ferg Cardinality Constraints in Entity-Relationship Modeling. 1-30 1991 ER db/conf/er/er91.html#Ferg91 conf/er/91 db/conf/er/Ferg91.html er91/ER91-P001.pdf ... journals/cacm/BlahaPR88 ... journals/tods/Chen76 ... journals/isci/Chen83 books/ph/yao85/Chen85 journals/tods/Codd79 journals/acj/Davenport79 conf/er/DogacC81 conf/er/EmbleyL89 ... conf/er/HabriasL88 ... ... ... conf/er/LenzeriniS83 ... ... ... ... ... conf/er/Rochfeld86 ... conf/er/ScheuermannSW79 ... ... journals/csur/TeoreyYF86 ... ... conf/er/Webre81