@article{DAN_1989_308_4_a8,
     author = {I. V. Fomenko},
     title = {Global conditions for the existence of self-oscillatory regimes in},
     journal = {Doklady Akademii Nauk},
     pages = {806--809},
     publisher = {mathdoc},
     volume = {308},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_4_a8/}
}