@article{DE_2004_40_8_a17,
     author = {O. G. Hudayberenow and N. O. Hudaywerenow},
     title = {An {Estimate} of the {Number} of {Periodic} {Solutions} of the {Abel} {Equation}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1140--1142},
     publisher = {mathdoc},
     volume = {40},
     number = {8},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_8_a17/}
}