[14] Liyun Zheng, Baozhi Cui, et al, Sm 2 Co 17 nanoparticles synthesized by surfactant-assisted high energy ball milling, J. Alloys Compd., 2012, 539: 69-73. SCI , IF=4.175 [15] Liyun Zheng, Baozhi Cui, Wanfeng Li, et al, Separated Sm-Co hard nanoparticles by an optimization of mechanochemical processes, J. Appl. Phys., 2012, 111: 07B536 SCI, IF=2.068