@article{DAN_1994_335_6_a15,
     author = {V. I. Zhuk},
     title = {Bifurcation of the upper branch of a neutral curve and the},
     journal = {Doklady Akademii Nauk},
     pages = {725--728},
     publisher = {mathdoc},
     volume = {335},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_335_6_a15/}
}