T. Sakairi and H. Nomiyama,
"An Operation History Management Method Using a Tree Structure,"
in Proceedings of the 61st Annual Convention IPS Japan, 3L-06 (Oct. 2000)
K. Takeda, "Text Mining for Knowledge Management ",
IPSJ Fall Meeting, (Sept. 1999).
M. Kobayashi, G. Dupret and O. King, "Linear Algebra Methods
for Text Mining", IPSJ Fall Meeting, (Sept. 1999).
T. Sakairi, "A Technique for Visualizing Document Data and Those Additional Information in Text Mining Systems",
IPSJ Fall Meeting, (Sept. 1999).
