@misc{10481/99458,
year = {2019},
month = {4},
url = {https://hdl.handle.net/10481/99458},
title = {Periodic solutions of second order equations via rotation numbers},
doi = {https://doi.org/10.1016/j.jde.2018.10.010},
author = {Qian, Dingbian and Torres Villarroya, Pedro José and Wang, Peiyu},
}