1) H.Shimada,T.Sasaoka,S.Kubota,K.Matsui and Y.Yoshida : Proc.of 12th International Symposium on Mine Planning and Equipment Selection, (2003), pp.199-204.
2) M.Koga, H.Shimada and K.Matsui : Shigen-to-Sozai, 116(2001), 209-214.
3) K.Matsui, H. Shimada, T.Sasaoka and A.Yabuki : Proc. of the 11th Japan Sympo. on Rock Mechanics, (2002), K02 (CD-ROM).