Balanov Z, Hooton E, Murza A. Periodic solutions of vdP and vdP-like systems on 3-Tori. TMNA [Internet]. 2017 Aug. 19 [cited 2024 Apr. 25];50(1):253-68. Available from: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.023