@article{TIMM_2021_27_1_a7,
     author = {A. O. Ignatyev},
     title = {On the existence of a periodic solution of the {Lienard} system with impulse effect},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {79--87},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2021_27_1_a7/}
}