1. Norman Blackburn, Problems on the theory of finite groups of prime-power order, PhD thesis, University of Cambridge, 1956
2. On a special class of p-groups;Blackburn;Acta Math.,1958
3. The derived group of a 2-group;Blackburn;Math. Proc. Cambridge Philos. Soc.,1987
4. On nilpotent Lie algebras;Bokut;Algebra i Logika,1971
5. On some properties of groups whose orders are powers of primes;Burnside;Proc. London Math. Soc. (2),1913