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@article{DE_1994_30_4_a7, author = {V. S. Klimov}, title = {On boundary value problems with an even number of solutions}, journal = {Differencialʹnye uravneni\^a}, pages = {630--636}, publisher = {mathdoc}, volume = {30}, number = {4}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1994_30_4_a7/} }
V. S. Klimov. On boundary value problems with an even number of solutions. Differencialʹnye uravneniâ, Tome 30 (1994) no. 4, pp. 630-636. http://geodesic.mathdoc.fr/item/DE_1994_30_4_a7/