Laser and electron beams physical analyses applied to the comparison between two silver tetradrachm greek coinsL. Torrisi, G. Mondio, A. M. Mezzasalma, D. Margarone, F. Caridi, T. Serafino and A. TorrisiEur. Phys. J. D, 54 2 (2009) 225-232DOI: https://doi.org/10.1140/epjd/e2008-00240-x