INTERNAL FRICTION ASSOCIATED WITH DOMAIN WALLS AND FERROELASTIC PHASE TRANSITION IN LNPP SUN WENYUAN, SHEN HUIMIN, WANG YENING and LU BAOSHENG J. Phys. Colloques, 46 C10 (1985) C10-609-C10-612 DOI: 10.1051/jphyscol:198510133