(3GdETQGa aj GdYed eY GdLeGYGJ (B/s - (3HgLJ, eMeO UGdMs ((3GdEScfOQjI, eUQ (B:s (3GdecJH GdLGeYj GdMOjK,s)
(3HHdjhLQGajI (B: (3U(B. 217-222.s
Keywords: (3NOeI GdLeGYIs; (3GdYed GdLeGYjs