@article{DAN_1996_348_5_a0,
     author = {N. A. Bobylev and A. V. Bulatov and S. K. Korovin and A. A. Kutuzov},
     title = {Limit cycles of autonomous systems},
     journal = {Doklady Akademii Nauk},
     pages = {583--586},
     year = {1996},
     volume = {348},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1996_348_5_a0/}
}