1. Homogeneization: Averaging processes in periodic media;Bakhvalov,1984
2. Asymptotic behavior of the solution of the equation μ2 Δu − k2(x,y)u = f(x,y) in a rectangular domain;Butuzov;Differentsial'nye Uravneniya,1973
3. Matching of the asymptotic expansions of solutions of boundary value problems;Il'in,1989
4. Boundary value problems for elliptic equations in domains with conical or angular points, Trudy Moskov;Kondratev;Math. Obshch,1967