$1'Uq'2>!9(!0%'_#'2>'bos - $1'c+'^+!8N!Oz!UNs ($1!04!4x!3K!JH!Nas, 1989)
Keywords: $1!04K7o'KG!0s!5=(B; $1!FMK7o!5=(B--$1K7o!FM!BA!<r'\Q!58!0w'=es