@article{ITA_2001__35_2_113_0,
     author = {Levene, Mark and Loizou, George},
     title = {A generalisation of entity and referential integrity in relational databases},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {113--127},
     publisher = {EDP-Sciences},
     volume = {35},
     number = {2},
     year = {2001},
     mrnumber = {1862458},
     zbl = {0992.68048},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_2001__35_2_113_0/}
}