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@article{KUKZ_1973_10_10_a4, author = {V. I. Zhegalov}, title = {Problems with derivatives in the boundary conditions}, journal = {Trudy seminara po kraevym zada\v{c}am}, pages = {38--52}, publisher = {mathdoc}, volume = {10}, number = {10}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KUKZ_1973_10_10_a4/} }
V. I. Zhegalov. Problems with derivatives in the boundary conditions. Trudy seminara po kraevym zadačam, Trudy Seminara po Kraevym Zadacham, Tome 10 (1973) no. 10, pp. 38-52. http://geodesic.mathdoc.fr/item/KUKZ_1973_10_10_a4/