MICROSTRUCTURE AND COERCIVITY IN (Nd, Dy)-(Fe, Co)-B BASED SINTERED PERMANENT MAGNETS WITH MINOR Nb AND Ga ADDITIONS G. F. Zhou, X. K. Sun, Y. C. Chuang, L. Gao, Z. Yu, C. L. Xiao et W. Liu J. Phys. Colloques, 49 C8 (1988) C8-573-C8-574 DOI: 10.1051/jphyscol:19888260