$1'Uq!Bg!_Z(B. $1!Ur!2m!8:(B. $1-5\!BP->@s - $1!Ct!Tk!OG'Q[!UNs ($1!5E!Cb!3K!JH!Nas, 1988)
Keywords: $1!04K7o'2F'X<'5+'CUs