@article{MM_1990_2_8_a13,
     author = {V. A. Il'in and E. I. Moiseev},
     title = {2-D {Nonlocal} boundary value problem for {Poisson's} operator in differential and difference variants},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {139--156},
     publisher = {mathdoc},
     volume = {2},
     number = {8},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1990_2_8_a13/}
}