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1952 On the Existence of Periodic Solutions of the Non-linear Differential Equation, $\ddot{x}+a(x) \cdot \dot{x}+\varphi (x)=p(t)$
Sigeru Mizohata, Masaya Yamaguti
Mem. College Sci. Univ. Kyoto Ser. A Math. 27(2): 109-113 (1952). DOI: 10.1215/kjm/1250777600
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