@article{DE_1983_19_9_a0,
     author = {A. I. Domoshnitskii},
     title = {Extension of the {Sturm} theorem to equations with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1475--1482},
     publisher = {mathdoc},
     volume = {19},
     number = {9},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_9_a0/}
}