(3GdeYhbhf h GdeScf h GdeOjfI (B: s (3HMK dhGLHGJ GdegfOS GdeYeGQj h egfOS GdHdOjGJ fMh GdeYhbjf (B/ s - (3MeGO, eMeO eUWais ((3GdbGgQg (B:s (3GdgjFI GdeUQjI GdYGeg,s, 1990)
Keywords: (3GdgfOSI GdeYeGQjIs; (3GdeYhbhfs