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@article{DE_1979_15_2_a21, author = {T. Sh. Kal'menov}, title = {The spectrum of the {Tricomi} problem for a fourth-order equation of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {354--356}, publisher = {mathdoc}, volume = {15}, number = {2}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1979_15_2_a21/} }
T. Sh. Kal'menov. The spectrum of the Tricomi problem for a fourth-order equation of mixed type. Differencialʹnye uravneniâ, Tome 15 (1979) no. 2, pp. 354-356. http://geodesic.mathdoc.fr/item/DE_1979_15_2_a21/