1. R. Baer, Groups with preassigned central and central quotient group, Trans. Amer. Math. Soc., 44, 387–412 (1938).
2. F. R. Beyl, U. Felgner, P. Schmid, On groups occurring as a center factor groups, J. Algebra, 61, 161–177 (1979).
3. G. Ellis, Capability, homology, and central series of a pair of groups, J. Algebra, 179, 31–46 (1996).
4. P. Hall, The classification of prime-power groups, J. Reine Angew. Math., 182, 130–141 (1940).
5. M. Hall, J. K. Senior, The Groups of Order 2n (n ≤ 6), MacMillan, New York, (1964).
6. N. S. Hekster, On the structure of n-isoclinism classes of groups, J. Pure Appl. Algebra, 40, 63–85 (1986).
7. I. M. Isaacs, Derived subgroups and centers of capable groups, Proc. Amer. Math. Soc., 129, 2853–2859 (2001).
8. J. -L. Loday, Cohomologie et groupe de Steinberg relatifs, J. Algebra, 54, 178–202 (1978).