Pisani, Lorenzo, and Gaetano Siciliano. “Neumann Condition in the Schrödinger-Maxwell System”. Topological Methods in Nonlinear Analysis 29, no. 2 (June 1, 2007): 251–264. Accessed May 6, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2007.010.