(3HUeGJ Ydi hdOj (B/s - (3GdjMji, WjHIs ((3GdchjJ (B:s (3ecJHI GdefGQ GdESdGejI ;s (3GdQjGV (B:s (3OGQ GdgLQI,s, 1989)
Keywords: (3GdJdjaRjhf hGdCWaGds; (3GdEYdGe GdESdGejs; (3JQHjI GdCWaGds