@article{DE_1976_12_4_a20,
     author = {L. M. Kuks},
     title = {A certain variant of an identity of {Picone} type, and {Sturm's} theorems for higher order ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {758--759},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_4_a20/}
}