@article{DE_1973_9_12_a12,
     author = {B. M. Lisitsyn and \`E. M. Lisitsyn},
     title = {The solution of a certain class of boundary value problems with mixed boundary conditions by the method of determining states},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2213--2221},
     publisher = {mathdoc},
     volume = {9},
     number = {12},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_12_a12/}
}