Eigen-values and characteristic functions of some fourth order differential operators containing a small parameter in the higher derivative term
Doklady Akademii Nauk, Tome 123 (1958) no. 2, pp. 249-251.

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     author = {A. A. Shishkin},
     title = {Eigen-values and characteristic functions of some fourth order differential operators containing a small parameter in the higher derivative term},
     journal = {Doklady Akademii Nauk},
     pages = {249--251},
     publisher = {mathdoc},
     volume = {123},
     number = {2},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_123_2_a9/}
}
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A. A. Shishkin. Eigen-values and characteristic functions of some fourth order differential operators containing a small parameter in the higher derivative term. Doklady Akademii Nauk, Tome 123 (1958) no. 2, pp. 249-251. http://geodesic.mathdoc.fr/item/DAN_1958_123_2_a9/