@article{DE_1978_14_2_a6,
     author = {V. A. Tyshkevich},
     title = {The problem of the accumulation of perturbations for linear differential equations with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {255--267},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_2_a6/}
}