@article{IVM_2024_11_a0,
     author = {V. V. Amel'kin and V. Yu. Tyshchenko},
     title = {Isochronous centers and foci of two-dimensional holomorphic differential systems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--11},
     year = {2024},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2024_11_a0/}
}