THEORETICAL STUDIES OF THE ATOMIC AND ELECTRONIC STRUCTURES OF GRAIN BOUNDARIES IN SILICON AND SILICON-CARBIDE M. KOHYAMA, Y. EBATA, S. ROSE, M. KINOSHITA and R. YAMAMOTO J. Phys. Colloques, 51 C1 (1990) C1-209-C1-214 DOI: 10.1051/jphyscol:1990132