(3JONd bGfhf GdYbhHGJ bj eLGd JfajP GdYbhO GdeOfjI(B/s - (3GdOcJhQ eMeO YjO GdZQjH(B.s ((3GdaLGdI (B:s (3ecJHI ZQjH ,s, 1988)
(3jTJed Ydi GQLGYGJ HHdjhLQGajIs
Keywords: (3bGfhf GdYbhHGJs; (3GdYbhO GdeOfjIs