Bak, S. M., and G. M. Kovtonyuk. “Periodic Traveling Waves in Fermi–Pasta–Ulam Type Systems With Nonlocal Interaction on 2d-Lattice”. Matematychni Studii 60, no. 2 (December 18, 2023): 180-190. Accessed November 1, 2024. http://matstud.org.ua/ojs/index.php/matstud/article/view/410.