1. On the number of crossed homomorphisms;Asai;Hokkaido Math. J.,1999
2. |Hom(A,G)|, II;Asai;J. Algebra,1993
3. Theory of Groups of Finite Order;Burnside,1955
4. A contribution to the theory of groups of prime-power order;Hall;Proc. London Math. Soc. (2),1933
5. On a theorem of Frobenius;Hall;Proc. London Math. Soc. (2),1935