$13BD!S,!BX'\O(B. $1!Os!0T!30(B. $1!0%s - $13BD!S,!3K!JH!Na!C\!^v!3'!5-'Q['[M!9f'6>'CZ'U<!BX'Q+s ($13BD!S,!3K!JH!Na!C\!^v!3'!5-s, 1969)
Keywords: $1!04!Oz3BD!S,s