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// Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika
// Archive
Izv. Vyssh. Uchebn. Zaved. Mat.,
1964
Number 3,
Pages
120–122
(Mi ivm2433)
On the absence of periodic solutions taking the value
$x=0$
in a class of differential equations of the form
$\ddot x+x=F(x,\,\dot x)$
G. E. Popov
Serpukhov.
Received:
15.09.1960
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Steklov Math. Inst. of RAS
, 2024