The non-oscillation problem for linear equations of fourth order
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1958), pp. 248-250.

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@article{IVM_1958_3_a31,
     author = {E. S. Chichkin},
     title = {The non-oscillation problem for linear equations of fourth order},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {248--250},
     publisher = {mathdoc},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1958_3_a31/}
}
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E. S. Chichkin. The non-oscillation problem for linear equations of fourth order. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1958), pp. 248-250. http://geodesic.mathdoc.fr/item/IVM_1958_3_a31/