(3MLjI GdMce GdLfGFi CeGe GdbVGA GdeOfi (B/s - (3EOhGQ ZGdj GdOgHjs ((3GdbGgQI (B:s (3ecJHI ZQjH ,s, 1990)
439-449(3HHdjhLQGajG(B: (3UaMGJ(B.s
(3jTed Ydj GQLGYGJ HHdjhLQGajIs
Keywords: (3GdbGfhf GdLfGFjs