Ultrasound-induced echoes in the nuclear-exciton decay utilising synchrotron radiation Bragg-scattered by a quartz crystalH. Jex, A. Ludwig, F. J. Hartmann, E. Gerdau and O. LeupoldEurophys. Lett., 40 3 (1997) 317-322DOI: https://doi.org/10.1209/epl/i1997-00465-1