@article{DAN_1967_176_1_a0,
     author = {P. G. Aizengendler and M. M. Vainberg},
     title = {The branching of periodic solutions of autonomous systems and of differential equations in {Banach} spaces},
     journal = {Doklady Akademii Nauk},
     pages = {9--12},
     publisher = {mathdoc},
     volume = {176},
     number = {1},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_176_1_a0/}
}