@article{MZ_1962__79_170055,
     author = {P. X. Gallagher},
     title = {Group characters and commutators.},
     journal = {Mathematische Zeitschrift},
     pages = {122--126},
     year = {1962},
     volume = {79},
     zbl = {0129.01902},
     url = {http://geodesic.mathdoc.fr/item/MZ_1962__79_170055/}
}