@article{ITA_1996__30_1_31_0,
     author = {Lippe, E. and Ter Hofstede, A. H. M.},
     title = {A category theory approach to conceptual data modeling},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {31--79},
     publisher = {EDP-Sciences},
     volume = {30},
     number = {1},
     year = {1996},
     mrnumber = {1398858},
     zbl = {0851.68019},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1996__30_1_31_0/}
}