(3GdGbJVGH aj TQM GOH GdcJGHs - (3GdHWdhSj,GHh eMeO YHO Gddg Hf eMeO Hf GdSjOs ((3HZOGO(B:s (3OGQ GdTDf GdKbGajIs, 1990)
Keywords: (3GdGOH GdYQHjs -- (3JGQjN hfbOs