(3bQGQ QFjS GdeLdS GdCYdi ddTHGH hGdQjGVI Qbe (B470 (3dSfI (B1992 :s (3HTCf CMcGe GdfXGe GdCSGSj ddCfOjI GdQjGVjI hLejY GdbQGQGJ GdefaPI hGdecedI dg (B((3GdLRA GdSGOS(B) /s - (3eUQ(B.s ((3GdbGgQI (B:s (3GdgjFI GdYGeI dTFhf GdeWGHY GdCejQjI,s, 1993)
Keywords: (3JTQjYGJ hbhGfjfs; (3GdCfOjI GdQjGVHI(B.s