@article{DAN_1980_254_1_a21,
     author = {Ya. B. Zel'dovich and B. A. Malomed},
     title = {Topological invariants and strings in self-oscillatory system},
     journal = {Doklady Akademii Nauk},
     pages = {92--94},
     publisher = {mathdoc},
     volume = {254},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_254_1_a21/}
}