@article{CMH_1938__11_138719,
     author = {P. Hall},
     title = {A partition formula connected with {Abelian} groups.},
     journal = {Commentarii mathematici Helvetici},
     pages = {126--129},
     publisher = {mathdoc},
     volume = {11},
     year = {1938},
     zbl = {64.0060.04},
     url = {http://geodesic.mathdoc.fr/item/CMH_1938__11_138719/}
}