(3JGQjN GdMQhH GdUdjHjI (B: s (3GdCYeGd GdefLRI hQGA GdHMGQ (B/ s - (3hdje, s; (3RcGQ, Sgjds ((3OeTb (B:s (3OGQ GdacQ ddWHGYI h GdfTQ h GdJhRjY,s, 1990)
Keywords: (3GdYQHs; (3GdJGQjNs; (3GdUdjHjhfs; (3GdMQhH GdUdjHjIs