(3GdJQHjI GdESdGejI W (B13s - (3Gd(B^(3NjGW(B. (3YHO GdYRjRs ((3hRGQI GdJQHjI h GdJYdjes (3YeGfs, 1975)
Keywords: (3GdKbGaI GdESdGejIs