@article{MZ_1961__75_169927,
     author = {Otto H. Kegel},
     title = {Die {Nilpotenz} der {Hp-Gruppen.}},
     journal = {Mathematische Zeitschrift},
     pages = {373--376},
     publisher = {mathdoc},
     volume = {75},
     year = {1961},
     zbl = {0104.24904},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__75_169927/}
}