Application of the Lie symmetry approach to an extended Jimbo–Miwa equation in (3+1) dimensionsSachin Kumar, Vishakha Jadaun and Wen-Xiu MaEur. Phys. J. Plus, 136 8 (2021) 843DOI: https://doi.org/10.1140/epjp/s13360-021-01813-1