@article{CHEB_2016_17_2_a3,
     author = {I. V. Goryuchkina},
     title = {Classes of finite order formal solutions of an ordinary differential equation},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {64--87},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2016_17_2_a3/}
}