@article{VMUMM_2025_2_a13,
     author = {I. N. Sergeev},
     title = {Radial stability and instability of differential system},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {83--88},
     publisher = {mathdoc},
     number = {2},
     year = {2025},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2025_2_a13/}
}