1. S. A. Arakcheev, ?Partial regularity of solutions of the Dirichlet problem for quasilinear elliptic equations,? Differents. Uravn. Chastn. Proizvodn. Tr. Serain. S. L. Sobolev, Novosibirsk, No. 2, 5?32 (1979).
2. A. V. Babin, ?Properties of quasilinear elliptic maps and nonlinear elliptic boundary problems,? Vestn. Mosk. Gos. Univ. Mat., Mekh., No. 5, 13?19 (1975).
3. A. V. Babin, ?Finite-dimensionality of the kernel and cokernel of quasilinear elliptic maps,? Mat. Sb.,93, No. 3, 422?450 (1974).
4. F. Baushke, ?Existence theorems for asymptotic points of bifurcation for the equation Au + ?Tu=0 in a Banach space,? Mat. Fiz., Kiev, No. 34, 52?57 (1983).
5. N. S. Bakhvalov and G. P. Panasenko, Averaging Processes in Periodic Media [in Russian], Nauka, Moscow (1984).