@article{ZNSL_2021_507_a8,
     author = {A. Baddour and M. D. Malykh and L. A. Sevastianov},
     title = {On periodic approximate solutions of dynamical systems with a quadratic right-hand side},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {157--172},
     publisher = {mathdoc},
     volume = {507},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2021_507_a8/}
}