$1![v!>c!R_!M"!0!!Ky(B: $1!GW!C!!9o'2F(B. $1!0&s - $1'Yh'3ks ($1!H#!4c!BX'V1!3K!JH!Nas, 1992)
Keywords: $1!5E!0d'2F'X<s