SPIN-SPIN RELAXATION OF Yb3+ IN PARAMAGNETIC DyAlO3, TbAlO3 AND HoAlO3 J.A. Hodges and P. Imbert J. Phys. Colloques, 40 C2 (1979) C2-253-C2-254 Published online: 20 May 2010 DOI: 10.1051/jphyscol/1979253