Fuzhong Cong. Periodic solutions for second order differential equations. Appl. Math. Lett., 18(8):957-961, 2005. [doi]
@article{Cong05,
title = {Periodic solutions for second order differential equations},
author = {Fuzhong Cong},
year = {2005},
doi = {10.1016/j.aml.2004.06.025},
url = {http://dx.doi.org/10.1016/j.aml.2004.06.025},
researchr = {https://researchr.org/publication/Cong05},
cites = {0},
citedby = {0},
journal = {Appl. Math. Lett.},
volume = {18},
number = {8},
pages = {957-961},
}