$1!0-!L,'`F'VJ!;'!RK!M"!Ky!GD'T2'>w!>[s - $1'7a!1A!JY(B. $1'2-!U!'Q"s ($1'U<!8x!3K!JH!Nas, 1988)
Keywords: $1!R;K7o'2F'X<s