@article{INTO_2022_217_a6,
     author = {E. Yu. Liskina},
     title = {Sufficient conditions for the existence of a center in a second-order nonlinear dynamical system in a critical case},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {51--62},
     publisher = {mathdoc},
     volume = {217},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2022_217_a6/}
}