ZHANG, Lin, LI, Yongqing and WANG, Zhi-Qiang. Multiple normalized solutions for a quasi-linear Schrödinger equation via dual approach. Topological Methods in Nonlinear Analysis. Online. 26 February 2023. Vol. 61, no. 1, pp. 465 - 489. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2022.052.