@article{MSH_1964__7__11_0,
     author = {Barbut, M.},
     title = {Un exercice sur la g\'en\'eration des structures alg\'ebriques},
     journal = {Math\'ematiques et sciences humaines},
     pages = {11--27},
     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {7},
     year = {1964},
     language = {fr},
     url = {http://archive.numdam.org/item/MSH_1964__7__11_0/}
}