1. G. Higman, ?Representation of general linear groups and varieties of groups?, Proc. Intern. Conf. Theory of Groups, Canberra (1965).
2. A. Klyachko, ?Manifolds of p-groups of small class?, in the collection Ordered Sets and Lattices, Vol. 1, Saratov University Press, 1971, 31?42.
3. E. B. Curtis, ?Some relations between homotopy and homology?, Ann. Math.,82, No. 3, 386?413 (1965).
4. M. Burrow, ?Invariants of free Lie rings,? Communs. Pure and Appl. Math.,11, 419?431 (1958).
5. J.-P. Serre, Lie Algebras and Lie Groups [Russian translation], Mir, Moscow (1969).