@article{MZ_1970__115_171329,
     author = {Patrick X. Gallagher},
     title = {Counting {Subgroups} of {Linear} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {9--10},
     publisher = {mathdoc},
     volume = {115},
     year = {1970},
     zbl = {0186.04203},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__115_171329/}
}