(3GdJYOi Ydi Mb GdEfSGf ai SQjI GJUGdGJg GdTNUjI Hjf GdJLQje hGdeTQhYjI (B/s - (3eMehO CMeO Wgs ((3GdbGgQI (B:s (3OGQ GdfgVI GdYQHjI ,s, 1999)
. 266 -252 (3HHdjhLQGajG(B: (3UaMGJ(B.s
(3jTJed Ydj GQLGYGJ HHdjhLQGajI(B.s
(3GdfU CZdHg HGddZI GdYQHjI eY HYV GdfUhU GdEfLdjRjIs
Keywords: (3GdMeGjI GdLfGFjI ddMQjGJ GdTNUjIs; (3GdbGfhf GdLfGFjs