Bak, S. M., and H. M. Kovtoniuk. “Subsonic Periodic Traveling Waves in Fermi–Pasta–Ulam Type Systems With Nonlocal Interaction on 2d-Lattice”. Matematychni Studii, Vol. 62, no. 2, Dec. 2024, pp. 184-91, doi:10.30970/ms.62.2.184-191.