1. Y. Berkovich, Groups of Prime Power Order, Book I, unpublished, 2004
2. Y. Berkovich, Z. Janko, Groups of Prime Power Order, Part III, unpublished, 2004
3. On prime-power groups in which the derived group has two generators;Blackburn;Proc. Cambridge Philos. Soc.,1957
4. On a special class of p-groups;Blackburn;Acta Math.,1958
5. Generalizations of certain elementary theorems on p-groups;Blackburn;Proc. London Math. Soc. (3),1961