(3YbhHI GdEYOGe Hjf GdEHbGA h GdEdZGA (B/ s - (3Ydj, RjGOs ((3WQGHdS (B((3djHjG(B) :s (3LeYjI GdOYhI GdESdGejI GdYGdejI,s, 1989)
Keywords: (3GdYbhHGJs; (3GdbGfhf GdLfGFjs; (3YbhHI GdEYOGes