$1'7F!0s!O(':`!Be!9(!7y(B: $1'7Z!Be'FU!4%!0m'Q*s - $1!C!-MO'Q[!UNs ($1!Be'U<!3K!JH!Nas, 1988)
Keywords: $1!5s!5b!G*(B--$1'FU!4%s