(3ef GdBOGH hGdCNdGb GdESdGejI (B/s - (3YHOGddg YHOGdQMje GdYHGOi s ((3GdbGgQI (B:s (3eWHYI GdSYGOI,s, 1980)
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdTQjYI GdGSdGejIs