(3GdfXGe aj TQM TYQ GdeJfHj hGHj JeGe (B- (3GdLRA GdKGdKs - (3fYeGf(B. (3Nda QTjOs ((3OGQ GdTDhf GdKbGajIs (3HZOGOs, 1991)
Keywords: (3GdTYQ GdYQHjs