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@article{DAN_1989_304_3_a4, author = {M. K. Bugir}, title = {Conditions for the oscillation of equations of the form $L^ku+c(x,u)=f(x)$}, journal = {Doklady Akademii Nauk}, pages = {538--541}, publisher = {mathdoc}, volume = {304}, number = {3}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_3_a4/} }
M. K. Bugir. Conditions for the oscillation of equations of the form $L^ku+c(x,u)=f(x)$. Doklady Akademii Nauk, Tome 304 (1989) no. 3, pp. 538-541. http://geodesic.mathdoc.fr/item/DAN_1989_304_3_a4/