Analytical solutions of time-fractional wave equation by double Laplace transform method Aziz Khan, Tahir Saeed Khan, Muhammed I. Syam and Hasib Khan Eur. Phys. J. Plus, 134 4 (2019) 163 Published online: 18 April 2019 DOI: 10.1140/epjp/i2019-12499-y