EFG DETERMINATION IN MOHR SALT [Fe(NH4)2(SO4)2·6H2O] APPLICATION OF THE INTENSITY TENSOR TO THICK SINGLE CRYSTALS R. Zimmermann and R. Doerfler J. Phys. Colloques, 41 C1 (1980) C1-107-C1-108 DOI: 10.1051/jphyscol:1980118