@article{ASNSP_1976_4_3_1_37_0,
     author = {F\'ary, Istv\'an},
     title = {Algebraic theory of stacks},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {37--46},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 3},
     number = {1},
     year = {1976},
     mrnumber = {500911},
     zbl = {0322.06015},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1976_4_3_1_37_0/}
}