1. Lu Shouci.Powder Processing Technology. Beijing: Light Industrial Press of China, 1999: 282
2. XIE Quanmin, ZHU Ruigen, CHENG Kong. Grey Classification for Evaluating the Stability of Dangerous Rock-block Masses.J. Wuhan Univ. Tech.—Mater. Sci. Ed., 2000, 15 (1): 73–77
3. Zennosuke TANAKA, Masahiko UCHIYAMA. The Accurate Air Classification of Fine Particles.J. Soc. Powder Technol., 1996, 33: 248–254
4. Rachel Anna.Centrifugal Air Classification of the Particles Using Rotaing Disks.: [Ph D thesis]. University of Florida, 2001
5. Spalding D B. The Phoenics Encyclopedia, London, CHAM Ltd, 1994