Mechanical Spectroscopy in Nitrogen Implanted Copper O.A. Lambri, E.D. Bulejes, A.V. Morón Alcain, A.R. Saurit, G. Sánchez and J. Feugeas J. Phys. IV France, 06 C8 (1996) C8-361-C8-364 DOI: 10.1051/jp4:1996878