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@article{PFMT_2020_2_a14, author = {V. I. Mironenko and V. V. Mironenko}, title = {The center-focus problem and reflecting function}, journal = {Problemy fiziki, matematiki i tehniki}, pages = {80--84}, publisher = {mathdoc}, number = {2}, year = {2020}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PFMT_2020_2_a14/} }
V. I. Mironenko; V. V. Mironenko. The center-focus problem and reflecting function. Problemy fiziki, matematiki i tehniki, no. 2 (2020), pp. 80-84. http://geodesic.mathdoc.fr/item/PFMT_2020_2_a14/