(3cJGH GdMhGOK hGdHOY (B/s - (3GdWQWhTj, eMeO Hf GdhdjO Hf eMeO,s 451-520 (3g`(B.s; (3Yjhf, HTjQ eMeOs ((3GdQjGV (B:s (3ecJHI GdeDjO,s, 1991)
Keywords: (3GdHOY aj GdESdGes