On the Existence of Periodic Solutions of the Non-linear Differential Equation, $\ddot{x}+a(x) \cdot \dot{x}+\varphi (x)=p(t)$
Open Access
- 1 January 1952
- journal article
- Published by Duke University Press in Kyoto Journal of Mathematics
- Vol. 27 (2) , 109-113
- https://doi.org/10.1215/kjm/1250777600
Abstract
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