$1'I1!db!BX'2F(B: $1!Ky!5y!0=!IE'^L!C!s - $1!3A!:es ($1!4I!0a!4W!C[!BX'V1!3K!JH!Nas, 1988)
Keywords: $1'I1!db!BX'2F'X<s