(3GdCMRGH GdSjGSjI aj GdLRGFQ (B:s (3NdajGJ hMbGFb (B/s - (3QRGbj , YHO GdYGdj s ((3GdLRGFQ (B:s (3GdeDSSI GdhWfjI ddafhf GdeWHYjI ,s, 1990)
Keywords: (3GdLRGFQ s; (3GdCMRGH s; (3GdSjGSjI s