(3GdGQgGH (B:s (3eagheg hCge LQGFeg aj GdbGfhf GdOhdj GdLfGFj (B/s - (3eUWaj eUHGM OjGQgs ((3HfZGRj (B:s (3LGeYI bGQ jhfS,s, 1990)
(3jTJed Ydi eQGLY HHdjhLQGajI(B.s
Keywords: (3GdbGfhf GdLfGFjs; (3GdJTQjY GdNGU HGdEQgGHs