(3GdKbGaI GdESdGejI GdGUjdI heSJLOGJ GdYUQ (B/ s - (3GdefGSHI , Gejf eMeO SdGe s ((3YeGf (B: s (3eDSSI QGe ddJcfdhLjG , s, 1990)
Keywords: (3GdKbGaI GdESdGejI s