(3LQGFe GdbJd GdYeO YdeG h YedG (B/ s - (3Ndjd, YOdjs ((3GdbGgQI (B:s (3JhRjY GdecJHI GdbGfhfjI,s, 1987)
Keywords: (3GdbGfhf GdLfGFjs; (3GdYbhHGJs