Invariance properties and conservation laws of perturbed fractional wave equation Elham Lashkarian, Ahmad Motamednezhad and S. Reza Hejazi Eur. Phys. J. Plus, 136 6 (2021) 615 Published online: 02 June 2021 DOI: 10.1140/epjp/s13360-021-01595-6