@article{DAN_1969_186_3_a0,
     author = {P. G. Aizengendler and M. M. Vainberg},
     title = {The branching of periodic solutions of differential-difference equations},
     journal = {Doklady Akademii Nauk},
     pages = {495--498},
     publisher = {mathdoc},
     volume = {186},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_3_a0/}
}