1. Old and new problems and results in combinatorial number theory, L'Enseignement Mathématique;Erdös,1980
2. Probabilistic methods in group theory II;Erdös;Houston Math. J.,1976
3. Probabilistic methods in group theory;Erdös;J. Analyse Math.,1965
4. M.L. Furst J. Hopcroft E.M. Luks Polynomial-time algorithms for permutation groups, in: Proc. 21st IEEE Symposium on Foundations of Computer Science, Syracuse 1980 pp. 36–41.
5. R.J. Lipton Private communication 1979