Extreme acoustic anisotropy in crystals visualized by diffraction tensor Natalya F. Naumenko, Konstantin B. Yushkov and Vladimir Ya. Molchanov Eur. Phys. J. Plus, 136 1 (2021) 95 Published online: 18 January 2021 DOI: 10.1140/epjp/s13360-021-01072-0