(3UhQ GdfTGW GdEOGQj (B: s (3GdVHW GdEOGQj hGdeQGab GdYGeI(B. s (3GdcJGH GdKGfj (B/ s - (3eMeO MSfjf YHOGdYGds ([(3ecGf GdfTQ ZjQ eMOO(B] : s [(3GdfGTQ ZjQ eMOO(B](3, s, 1988)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdfTGW GdEOGQjs; (3GdVHW GdEOGQjs