$1!Pa'\3!12!0#!>n'?J']t(B. $1!7es - $1!Ic'_T!9%'<Q![ms ($1!12!2r!3K!JH!Nas, 1977)
Keywords: $1!123BD'2Y!=9(B--$1!123BD!G*'CZ(B, $1!12!0Ps