MÖSSBAUER STUDY OF LATTICE DYNAMICS OF HIGH Tc SUPERCONDUCTORS C. W. KIMBALL, G. VAN LANDUYT, J. SPILLMAN, E. E. CHAIN et F. Y. FRADIN J. Phys. Colloques, 37 C6 (1976) C6-29 DOI: 10.1051/jphyscol:1976606