ZHANG, Jian, TANG, Xianhua and ZHANG, Wen. Ground state solutions for a class of nonlinear Maxwell-Dirac system. Topological Methods in Nonlinear Analysis. Online. 1 December 2015. Vol. 46, no. 2, pp. 785 - 798. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2015.068.