TY - JOUR AU - Wang, Fanglei AU - Chu, Jifeng AU - Siegmund, Stefan PY - 2015/12/01 Y2 - 2024/03/29 TI - Periodic solutions for second order singular differential systems with parameters JF - Topological Methods in Nonlinear Analysis JA - TMNA VL - 46 IS - 2 SE - DO - 10.12775/TMNA.2015.058 UR - https://apcz.umk.pl/TMNA/article/view/TMNA.2015.058 SP - 549 - 562 AB - In this paper we consider the existence of periodic solutions of one-parameter and two-parameter families of second order singular differential equations. ER -