STUDY OF CALCIUM-IRON-SILICATE GLASSES BY MÖSSBAUER SPECTROSCOPY N. Iwamoto, Y. Tsunawaki, H. Nakagawa, M. Miyago, T. Yoshimura and N. Wakabayashi J. Phys. Colloques, 40 C2 (1979) C2-151-C2-152 DOI: 10.1051/jphyscol:1979253