@article{ASCFM_1986__89_23_99_0,
     author = {Migliorato, Renato},
     title = {Semi-ipergruppi e ipergruppi $n$-completi},
     journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques},
     pages = {99--123},
     year = {1986},
     publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont},
     volume = {89},
     number = {23},
     mrnumber = {891717},
     zbl = {0646.20066},
     language = {it},
     url = {https://www.numdam.org/item/ASCFM_1986__89_23_99_0/}
}