Abundant novel wave solutions of nonlinear Klein–Gordon–Zakharov (KGZ) model Mostafa M. A. Khater, A. A. Mousa, M. A. El-Shorbagy and Raghda A. M. Attia Eur. Phys. J. Plus, 136 5 (2021) 604 Published online: 31 May 2021 DOI: 10.1140/epjp/s13360-021-01385-0