(3LQGFe GdEYJOGA Ydi GdCTNGU(B/s - (3eMeO YHOGdMejO ecis ((3GdbGgQI (B:s (3OGQ GdfgVI GdYQHjI (B,s, 1990)
(3GdfU HGddZI GdYQHjIs
Keywords: (3bGfhf LfGFjs; (3GdLQGFe GdeGSI HGdCTNGUs