Maurizio Lenzerini Gaetano Santucci Cardinality Constraints in the Entity-Relationship Model. 529-549 1983 ER db/conf/er/er83.html#LenzeriniS83 conf/er/83 er83/ER83-P529.pdf db/conf/er/LenzeriniS83.html books/el/ceri83/AtzeniBCALVZ83 conf/er/AtzeniBLV81 books/el/ceri83/BertainaLG83 books/el/ceri83/BatiniLM83 journals/is/BatiniLS82 books/el/Ceri83 journals/tods/Chen76 conf/er/79 conf/er/81 ... ... conf/vldb/LumGSTJSFTYRKNSABJ79 journals/tods/SmithS77 conf/er/ScheuermannSW79 ... conf/er/WiederholdE79