@article{TRSPY_2020_308_a13,
     author = {A. N. Kanatnikov and A. P. Krishchenko},
     title = {Qualitative {Properties} of a {Duffing} {System} with {Polynomial} {Nonlinearity}},
     journal = {Informatics and Automation},
     pages = {197--209},
     publisher = {mathdoc},
     volume = {308},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2020_308_a13/}
}