$1!_-!66KNg!5=(B. $1!0&!30s - $1!6a!<e'1L'Q['[M!\ks ($1!58'ICs $1!6a!<e'1L!3K!JH!Nas, 1984)
Keywords: $1'YJ!5='`S(B: $1'CI!5=!;E'Xis