@article{ITA_1992__26_6_523_0,
     author = {Cacciari, Leo},
     title = {On the automorphism group of a toroidal hypermap},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {523--540},
     publisher = {EDP-Sciences},
     volume = {26},
     number = {6},
     year = {1992},
     mrnumber = {1195743},
     zbl = {0768.30029},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1992__26_6_523_0/}
}