@article{MZ_1968__106_171017,
     author = {L. Dornhoff and E.L. Spitznagel},
     title = {Density of {Finite} {Simple} {Group} {Orders.}},
     journal = {Mathematische Zeitschrift},
     pages = {175--177},
     publisher = {mathdoc},
     volume = {106},
     year = {1968},
     zbl = {0159.31103},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__106_171017/}
}