@article{DAN_1971_201_5_a8,
     author = {Jindrich Ne\v{c}as},
     title = {On the discreteness of the spectrum of a nonlinear {Sturm{\textendash}Liouville} equation},
     journal = {Doklady Akademii Nauk},
     pages = {1045--1048},
     year = {1971},
     volume = {201},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_201_5_a8/}
}