(3GdLfI (B: s (3fYjegG h GdWQjb GdjgG (B/ s - (3YHO GdMejO, Ydj MSf Ydjs ((3YeGf (B:s (3GdecJHI GdGSdGejI,s, 1990)
Keywords: (3CUhd GdOjf GdESdGejs; (3Gdjhe GdBNQs