Zhang, Lin, Yongqing Li, and Zhi-Qiang Wang. “Multiple Normalized Solutions for a Quasi-Linear Schrödinger Equation via Dual Approach”. Topological Methods in Nonlinear Analysis 61, no. 1 (February 26, 2023): 465–489. Accessed July 5, 2025. https://apcz.umk.pl/TMNA/article/view/42819.