(3GdeLehYI GdYdejI GdSYhOjI ef OQQ YdeGA GdSda GdUGdM (B/s - (3Hf MejO , YHO Gddg Hf eMeOs ((3GdQjGV (B:s (3ecJHI GdJhajb ,s, 1971)
Keywords: (3YbjOIs; (3JhMjO s