WANG, Lixiong, CHEN, Haibo and LIU, Senli. Existence and multiplicity of sign-changing solutions for a Schrödinger-Bopp-Podolsky system. Topological Methods in Nonlinear Analysis. Online. 12 June 2022. Vol. 59, no. 2B, pp. 913 - 940. [Accessed 3 July 2024]. DOI 10.12775/TMNA.2021.045.