(3GSJMcGeGJ GThQ (B/s - (3GfOQjg ,aGdJQ s; (3GdMSf,YHO GdQRGb cGed s ((3GdYQGb (B:s (3GdeDSSI GdYGeI ddGKGQhGdJQGK,s, 1987)
Keywords: (3GdGeHQGWhQjI GdGThQjI s