(3LQGFe GdTGFYGJ hELQGAGJgG (B/s - (3eJhdj, Wg CMeO Wgs ([(3ecGf GdfTQ ZjQ eMOO(B] :s [(3GdfGTQ ZjQ eMOO(B](3,s, 1997)
(3HHdjhLQGajI (B: (3UaMI (B363-375.s
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdETGYGJs; (3bGfhf GdYbhHGJs -- (3eUQs; (3GdbGfhf GdLfGFjs -- (3eUQs