@article{DE_1976_12_3_a1,
     author = {N. V. Azbelev and G. G. Islamov},
     title = {A certain class of functional-differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {417--427},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_3_a1/}
}