@article{DE_1967_3_10_a17,
     author = {B. P. Tkach},
     title = {A partial differential equation with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1796--1800},
     publisher = {mathdoc},
     volume = {3},
     number = {10},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_10_a17/}
}