Ji, Chao, and Olímpio H. Miyagaki. “Existence of Ground State Solutions for the Nonlinear Elliptic Equations With Zero Mass on Lattice Graphs”. Topological Methods in Nonlinear Analysis 66, no. 1 (October 1, 2025): 109–127. Accessed December 12, 2025. https://apcz.umk.pl/TMNA/article/view/65907.