@article{ISU_2015_15_2_a6,
     author = {V. B. Tlyachev and A. D. Ushkho and D. S. Ushkho},
     title = {An estimate from above of the number of invariant straight lines of $n$-th degree polynomial vector field},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {171--179},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2015_15_2_a6/}
}