@article{IVM_1969_11_a0,
     author = {P. G. Aizengendler and M. M. Vainberg},
     title = {The branching of periodic solutions of differential equations with {lag.~II}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--12},
     publisher = {mathdoc},
     number = {11},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_11_a0/}
}