DEFORMATION OF Al2O3 SINGLE CRYSTALS BETWEEN 25°C AND 1800°C : BASAL AND PRISMATIC SLIP J. Castaing, J. Cadoz and S.H. Kirby J. Phys. Colloques, 42 C3 (1981) C3-43-C3-47 DOI: 10.1051/jphyscol:1981304