(3GdUjZ GdbGfhfjI ddYbhO GdQSejI hGdYQajI (B/s - (3Thbi hgHI (B.s ((3GdbGgQg (B:s (3OGQ GdYGde GdYQHi ddWHGYI,s, 1990)
Keywords: (3GdYbhO(B.s; (3GdYbhO GdQSejI(B.s; (3GdYbhO GdYQajI(B.s; (3GdbGfhf GdeOfi (B.s; (3GdYbhO GdJi JbY Ydi GdedcjI (B.s; (3bGfhf GdYbhO h GdJhcjdGJ (B. s