1. N. Blackburn and B. Huppert, “Finite Groups II.” Springer-Verlag, Berlin/Heidelberg/New York, to appear.
2. On groups of even order;Brauer;Ann. of Math.,1955
3. On orders of finite groups and centralizers of p-elements;Fong;Osaka J. Math.,1976
4. Endliche Gruppen I;Huppert,1967
5. Locally Finite Groups;Kegel,1973