@article{MSH_1967__19__13_0,
     author = {Monjardet, B.},
     title = {II. {Quasi-groupes} finis, quasi-groupes orthogonaux, ensemble complet orthogonal},
     journal = {Math\'ematiques et sciences humaines},
     pages = {13--20},
     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {19},
     year = {1967},
     mrnumber = {227025},
     language = {fr},
     url = {http://archive.numdam.org/item/MSH_1967__19__13_0/}
}