(3edMb bGfhf GdJCejf GdGLJeGYj GdUGOQ HGdbGfhf Qbe (B79 (3dSfI (B1975 ((3eYOdkG(B) :s (3hGdbhGfjf GdeYOdg dg hGdbQGQGJ GdeJYdbI Hg (B/s - (3eUQ(B.s ((3GdbGgQI (B:s (3GdgjFI GdYGeI dTFhf GdeWGHY GdCejQjI,s, 1990)
Keywords: (3JTQjYGJ hbhGfjfs; (3GdJCejfGJ GdCLJeGYjI(B.s