Report copyright - Osaka University Knowledge Archive : OUKA...1991 6 1,454 0 1992 7 307 0 1993 3 93 0 1994 6 564 0 1995 5 192 0 1996 5 64 0 1997 5 315 0 1998 9 1,270 0 1999 6 402 209 2000 12 1,479 0
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