(3GdLdjS GdUGdM h GdCfjS GdfGUM (B/ s - (3jhSa, TeS GdOjf CHh GdeXaQs; (3GdYjShi, CMeOs ((3WfWG (B:s (3OGQ GdUMGHI ddJQGK,s, 1991)
Keywords: (3GdMOjK GdTQjas; (3GdESdGes; (3GdhYX h GdEQTGOs