@article{DE_1974_10_11_a5,
     author = {V. A. Deyft},
     title = {Conditions of disconjugacy for a linear homogeneous differential equation with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1957--1963},
     publisher = {mathdoc},
     volume = {10},
     number = {11},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_11_a5/}
}