Ambrosio, V. (2016) “Periodic solutions for the non-local operator $(-\Delta+m^{2})^{s}-m^{2s}$ with $m\geq 0$”, Topological Methods in Nonlinear Analysis, 49(1), pp. 75–103. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.2016.063 (Accessed: 3 May 2024).