$1!04K7o!0d!M"'b^!3+!>4!DU(B: $1!0d!>['T2'b^!:Ms - $1'`v!=u!?/!O|'3|s ($1'=G!R\'<Q!3K!JH!Nas, 1990)
Keywords: $1!Na'CZ!=x!KH':`s