EVIDENCE OF VALENCE FLUCTUATIONS IN YTTERBIUM BASED AMORPHOUS ALLOYS D. Malterre, J. Durand, A. Siari, A. Menny, G. Krill et G. Marchal J. Phys. Colloques, 49 C8 (1988) C8-1361-C8-1362 DOI: 10.1051/jphyscol:19888623