@article{MZ_1972__124_171656,
     author = {Fredrik L. Smith},
     title = {A {Note} on the {Covering} {Groups} of ...n, n ... 6.},
     journal = {Mathematische Zeitschrift},
     pages = {64--66},
     publisher = {mathdoc},
     volume = {124},
     year = {1972},
     zbl = {0213.30503},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__124_171656/}
}