Cingolani, S. and Lazzo, M. (1997) “Multiple semiclassical standing waves for a class of nonlinear Schrödinger equations”, Topological Methods in Nonlinear Analysis, 10(1), pp. 1–13. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.1997.019 (Accessed: 22 July 2024).