@article{RSMUP_1975__54__271_0,
     author = {Grandis, Marco},
     title = {Sym\'etrisations de cat\'egories - {I} : g\'en\'eralit\'es},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {271--310},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {54},
     year = {1975},
     mrnumber = {450362},
     zbl = {0355.18005},
     language = {fr},
     url = {http://archive.numdam.org/item/RSMUP_1975__54__271_0/}
}