@article{DAN_1997_353_1_a3,
     author = {A. P. Krishchenko},
     title = {Domains of existence of cycles},
     journal = {Doklady Akademii Nauk},
     pages = {17--19},
     publisher = {mathdoc},
     volume = {353},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_353_1_a3/}
}