@article{DE_1970_6_11_a15,
     author = {I. M. Velikoivanenko and I. I. Lyashko and G. E. Mistetskiy},
     title = {A general solution of a finite difference problem for the equation ${\rm div(K}\nabla \Psi )=F$ with piecewise constant $\chi $ and with {Neumann} conditions on a part of the boundary},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2074--2079},
     year = {1970},
     volume = {6},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_11_a15/}
}