INHOMOGENEOUS PROPERTIES OF IONIC SEMI-SPIN-GLASSES STUDIED BY MÖSSBAUER SPECTROSCOPY M. Zemirli, J. M. Grenèche, F. Varret, M. Lenglet and J. Teillet J. Phys. Colloques, 49 C8 (1988) C8-917-C8-918 DOI: 10.1051/jphyscol:19888417