The Bordoni Relaxation in High Purity Copper Single Crystals at Low Frequencies A. Ghilarducci, A. Moreno-Gobbi, M. Marotti et J. A. EirasJ. Phys. IV France, 06 C8 (1996) C8-211-C8-214DOI: https://doi.org/10.1051/jp4:1996844