@article{DE_1999_35_10_a5,
     author = {Ya. M. Dymarskii},
     title = {On a countable set of normalized eigenfunctions of a nonlinear periodic problem with a transformed argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1337--1342},
     publisher = {mathdoc},
     volume = {35},
     number = {10},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_10_a5/}
}