(3ehSe GdfHj ehSi aj adSWjf (B: s (3JGQjN GdehSe h GdebGe (B/ s - (3GdYSdj, cGed Lejds ((3YeGf (B:s (3GdLGeYI GdCQOfjI,s, 1990)
Keywords: (3GdeRGQGJ GdESdGejIs; (3adSWjfs; (3GdESdGes; (3GdTYGFQs