@article{ITA_1977__11_4_329_0,
     author = {Sanchis, Luis E.},
     title = {Data types as lattices : retractions, closures and projections},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {329--344},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {4},
     year = {1977},
     mrnumber = {495139},
     zbl = {0394.03019},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1977__11_4_329_0/}
}