1998. $1!04K7o(B. $1!0%!30s - $1'c,!Tk'[H!09'Q[s ($1!Kv'S!!0d!FM!3K!JH!Nas, 1997)
Keywords: $1!04K7o!8{!0^(B--$1K7o'_7!7y!1+s