Lie symmetries, optimal system, group-invariant solutions and dynamical behaviors of solitary wave solutions for a (3+1)-dimensional KdV-type equationSachin Kumar, Dharmendra Kumar and Abdul-Majid WazwazEur. Phys. J. Plus, 136 5 (2021) 531DOI: https://doi.org/10.1140/epjp/s13360-021-01528-3