@article{SM_2023_214_2_a4,
     author = {A. V. Dukov},
     title = {Multiplicities of limit cycles appearing after perturbations of hyperbolic polycycles},
     journal = {Sbornik. Mathematics},
     pages = {226--245},
     publisher = {mathdoc},
     volume = {214},
     number = {2},
     year = {2023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2023_214_2_a4/}
}