(3Pe Gdghi (B/s - (3GHf GdLhRj, YHO GdQMef Hf Ydj Hf eMeO,s 508-597 (3gLQjs; (3YWG, CMeO YHO GdSdGes ((3HjQhJ (B:s (3OGQ GdcJH GdYdejI,s, 1987)
Keywords: (3GdCNdGb GdESdGejIs; (3GdhYX hGdEQTGOs