(3GdedNU dcJGH GdYQH hGdjghO aj GdJGQjN (B:s - (3GdNdjdj ,LYaQ s ((3HZOGO(B:s (3OGQ GdMQjI ddWHGYI ,s, 1977)
Keywords: (3GdYGde GdYQHj (B-(3JGQjN s