Beltrán, Antonio; Felipe Román, María Josefa(Springer Verlag (Germany), 2013-08)
Let G be a finite p-solvable group for some prime p and suppose that the set of p-regular conjugacy class sizes is {1,m,mn} with (m,n)=1 and m coprime to p. We show that m=qb for some prime q and we describe the structure ...