@article{ASCFM_1987__91_24_81_0,
     author = {Corsini, Piergiulio},
     title = {(I.P.S.) {Ipergruppi} di ordine 6},
     journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques},
     pages = {81--104},
     publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont},
     volume = {91},
     number = {24},
     year = {1987},
     mrnumber = {974417},
     zbl = {0658.20046},
     language = {it},
     url = {http://www.numdam.org/item/ASCFM_1987__91_24_81_0/}
}