(3GdGJLGgGJ GdMOjKI ddhbGjI ef dHLQjeI (B/ s - (3GdYhLj , eUWai s ((3GdQjGV (B: s (3GdeQcR GdYQHj ddOQGSGJ GdGefjI hGdJOQjH , s, 1987)
Keywords: (3GdLQjeI s