@article{TM_1984_163_a11,
     author = {E. A. Volkov},
     title = {An economical composite difference method for the {Dirichlet} problem in a~piecewise-homogeneous medium},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {49--73},
     year = {1984},
     volume = {163},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1984_163_a11/}
}