@article{DAN_1981_260_5_a4,
     author = {V. Ya. Derr},
     title = {A criterion for nonoscillation of the solutions of a homogeneous equation relative to a system of functionals},
     journal = {Doklady Akademii Nauk},
     pages = {1047--1051},
     publisher = {mathdoc},
     volume = {260},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_5_a4/}
}