4WANG Zuocheng,ZHANG Maocai,QIAO Yi,GAO Xuexum,LI Fubiao,ZHOU Shouzeng,WANG Run( State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China) ( Materials Science and Engineering School,.Nanocrystalline exchange-coupled Pr-Fe-B permanent magnets[J].International Journal of Minerals,Metallurgy and Materials,1997,11(3):11-13.
