Z. Arad et M. Muzychuk, ORDER EVALUATION OF PRODUCTS OF SUBSETS IN FINITE-GROUPS AND ITS APPLICATIONS - II, Transactions of the American Mathematical Society, 349(11), 1997, pp. 4401-4414
In this paper we give a new estimate of the cardinality of the product
of subsets AB in a finite non-abelian simple group, where A is normal
and B is arbitrary. This estimate improves the one given in J. Algebr
a 182 (1996), 577-603.