@article{DE_1968_4_7_a8,
     author = {V. I. Rozhkov},
     title = {An asymptotic power series expansion of the retardation of a periodic solution of an equation of neutral type with small retardation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1250--1257},
     publisher = {mathdoc},
     volume = {4},
     number = {7},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_7_a8/}
}