@article{DAN_1978_239_5_a1,
     author = {N. A. Bobylev and M. A. Krasnosel'skii},
     title = {Generalized {Ljapunov} systems},
     journal = {Doklady Akademii Nauk},
     pages = {1021--1024},
     publisher = {mathdoc},
     volume = {239},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_239_5_a1/}
}