$1'2z!Og!MJ'7t'YJ!5.'X\ (B- $1!0&(B, $1!0%!30s - $1!]>!ML!3K!JH!Na'Q[s ($1!]>!ML!3K!JH!Nas, 1990)
Keywords: $1'2z!Og!N#'Y<(B; $1':`'RMs