@article{TSP_2019_32_32_a13,
     author = {I. N. Sergeev},
     title = {Plane rotability exponents of a linear system of differential equations},
     journal = {Trudy Seminara im. I.G. Petrovskogo},
     pages = {325--348},
     year = {2019},
     volume = {32},
     number = {32},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TSP_2019_32_32_a13/}
}