(3GdHK GdEYdGej Yf WQjb GdCbeGQ GdUfGYjI h GdEYdGe GdYQHj (B/s - (3GdLhjdj, GdWjHs ((3HjQhJ (B:s (3OGQ GdeSjQI ,s, 1991)
Keywords: (3GdCbeGQ GdUfGYjIs; (3GdEjOjhdhLjIs; (3GdTHcGJs