Journal of Algebra, Number Theory: Advances and Applications[1] T. Ganea, Homologie et extensions centrales de groupes, C. R.
Acode. Sci. Paris 266 (1968), 556-568.
[2] W. Gaschutz, J. Neubuser and Tiyen, Uber der multiplikator von
p-Gruppen, Mathe Z 100 (1967), 92-96.
[3] M. R. Jones, Some inequalities for the multiplicator of a finite
group, Proc. Amer. Math. Soc. 39 (1973), 450-456.
[4] C. R. Leedham-Green and S. Mckay, Bear-invariants, isologism,
varietal laws and homology, Acta Math. 137 (1976), 99-150.
[5] M. R. R. Moghaddam, The Bear-invariant of a direct products, Arch.
Math. 33 (1980), 504-511.
[6] I. Schur, Uber die Darstellung der endelichen Gruppen druch
gebrochene linear substitutionen, J. Fur. Math. 127 (1904), 20-50.
[7] J. Stallings, Homology and central series of groups, J. Algebra 2
(1965), 170-181.
