1. Browkin, J., Schinzel, A.: On the equation 2n?D=y2. Bull. Acad. Pol. Sci.8, 311?318 (1960)
2. Chowla, S., Dunton, M., Lewis, D. J.: All integer solutions of 2n?7=x2 are given byn=3,4,5,7,15. Kongl. Norske Vidensk. Selsk. Forhandl. (Trondheim) B33, Nr. 9, 37?38 (1960)
3. Hasse, H.: Über eine Diophantische Gleichung von Ramanujan-Nagell und ihre Verall-gemeinerung. Nagoya Math. J.27, 77?102 (1966)
4. Hering, C.: Transitive linear groups and linear groups which contain irreducible subgroups of prime order. Geometriae Dedicata2, 425?460 (1974)
5. Hering, C.: On factorizations of finite simple groups. (To appear)