@article{MZ_1967__102_170873,
     author = {Patrick X. Gallagher},
     title = {Counting {Finite} {Groups} of {Given} {Order.}},
     journal = {Mathematische Zeitschrift},
     pages = {236--237},
     publisher = {mathdoc},
     volume = {102},
     year = {1967},
     zbl = {0189.02304},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__102_170873/}
}