(3GdQVG aj GdYbhO GdEOGQjI (B:s - (3eMeO LeGd YKeGf LHQjd(B.s ([(3ecGf GdfTQ ZjQ eMOO(B] :s [(3GdfGTQ ZjQ eMOO(B](3,s, 1990)
(3HHdjhLQGajG (B: (3UaMI (B93- 99.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3TQW cJGHI GdYbO GdEOGQjs; (3GdbGfhf GdEOGQis