@article{DE_1988_24_2_a7,
     author = {V. P. Tikhonov},
     title = {On relatedness theorems for equations with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {240--250},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_2_a7/}
}