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Chemodanov V I
Publications in Math-Net.Ru
Isochronism in the case of a focus
Differ. Uravn.
,
5
:5 (1969),
964–966
The isochronism of a certain system of differential equations
Differ. Uravn.
,
4
:5 (1968),
821–829
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Steklov Math. Inst. of RAS
, 2024