@article{Guo_2000, title={An ordinary differential equation arises in plane curve evolution}, volume={31}, url={https://journals.math.tku.edu.tw/index.php/TKJM/article/view/384}, DOI={10.5556/j.tkjm.31.2000.384}, abstractNote={Under some conditions on $ f$, we prove that any nontrivial positive solution of the ordinary differential equation $ uā€™ā€™+f(u)=0$ in $ {\bf R}$ is periodic.}, number={4}, journal={Tamkang Journal of Mathematics}, author={Guo, Yung-Jen Lin}, year={2000}, month={Dec.}, pages={273ā€“278} }