Geodesic
On the existence of an upper and a lower solution of a boundary value problem for a system of ordinary differential equations
Differencialʹnye uravneniâ, Tome 3 (1967) no. 8, pp. 1393-1396.

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     author = {A. N. Vityuk},
     title = {On the existence of an upper and a lower solution of a boundary value problem for a system of ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1393--1396},
     publisher = {mathdoc},
     volume = {3},
     number = {8},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_8_a18/}
}
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A. N. Vityuk. On the existence of an upper and a lower solution of a boundary value problem for a system of ordinary differential equations. Differencialʹnye uravneniâ, Tome 3 (1967) no. 8, pp. 1393-1396. http://geodesic.mathdoc.fr/item/DE_1967_3_8_a18/