(3UjO GdNGWQ (B/s - (3GHf GdLhRj, YHO GdQMef Hf Ydj Hf eMeO,s 508-597 (3g`(B.s; (3YWG, YHO GdbGOQ CMeO,s ((3HjQhJ (B:s (3OGQ GdcJH GdYdejI,s, 1999)
Keywords: (3GdhYX hGdEQTGOs