(3bGfhf GdeQhQ GdUGOQ HGdbGfhf Qbe (B66 (3dSfI (B1973 (3hdGFMJg GdJfajPjI hGdbQGQGJ GdeJYdbI Hg (B:s (3WHbkG dCMOK GdJYOjdGJ (B/s - (3eUQ(B.s ((3GdbGgQI (B:s (3GdgjFI GdYGeI dTFhf GdeWGHY GdCejQjI,s, 1991)
Keywords: (3JTQjYGJ hbhGfjfs; (3GdeQhQ(B.s