Geodesic
The existence of periodic solutions of an autonomous second order non-linear differential equation
Annales Polonici Mathematici, Tome 30 (1974) no. 2, pp. 165-174

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G. J. Butler. The existence of periodic solutions of an autonomous second order non-linear differential equation. Annales Polonici Mathematici, Tome 30 (1974) no. 2, pp. 165-174. doi: 10.4064/ap-30-2-165-174
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     title = {The existence of periodic solutions of an autonomous second order non-linear differential equation},
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