OBSERVATION OF A LOW ANGLE GRAIN BOUNDARY IN TOOTH ENAMEL CRYSTALS USING HREM E.F. BRÈS, J.L. HUTCHISON, J.-C. VOEGEL et R.M. FRANK J. Phys. Colloques, 51 C1 (1990) C1-97-C1-102 DOI: 10.1051/jphyscol:1990113