The use of operators that have certain properties in qualitative investigations of differential equations
Differencialʹnye uravneniâ, Tome 6 (1970) no. 11, pp. 1976-1981.

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     author = {Yu. K. Metlyaev},
     title = {The use of operators that have certain properties in qualitative investigations of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1976--1981},
     publisher = {mathdoc},
     volume = {6},
     number = {11},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_11_a5/}
}
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Yu. K. Metlyaev. The use of operators that have certain properties in qualitative investigations of differential equations. Differencialʹnye uravneniâ, Tome 6 (1970) no. 11, pp. 1976-1981. http://geodesic.mathdoc.fr/item/DE_1970_6_11_a5/