2) Gondoh, T., M. Toh and Y. Murakami: “Behavior of grinding media in sand mill”, J. Japan. Soc. Colour Materal, 62, 202-207 (1989)
3) Gondoh, T., M. Toh, Y. Murakami, Y. Hashi and M. Kusunoki: “Behavior of grinding media in a sand mill”, J. Japan. Soc. Colour. Materal, 64, 297-304 (1991)
4) Hashi, Y. and M. Senna: “Grinding efficiency of an agitiation-Beads mill (II)”, J. Soc. Powder Technol., Japan, 28, 738-744 (1991)