@article{ITA_1977__11_4_303_0,
     author = {P\u{a}un, G.},
     title = {An operation with languages occurring in the linguistic approach to the management},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {303--310},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {4},
     year = {1977},
     mrnumber = {495257},
     zbl = {0371.68026},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1977__11_4_303_0/}
}