STUDY OF THE STRUCTURE AND DYNAMIC BEHAVIOUR OF GRAIN BOUNDARIES USING DYNAMIC BALL-MODEL R. PINO PLASENCIA, D.L. BEKE, G. ERDÉLYI et F.J. KEDVES J. Phys. Colloques, 51 C1 (1990) C1-317-C1-322 DOI: 10.1051/jphyscol:1990150