(3Yjf GdJGQjN JTgO cHGQ GdeNJQYjf (B/ s - (3bSe GdJCdja h GdJQLeI HOGQ GdQTjOs ((3OeTb (B:s (3OGQ GdQTjO,s, 1990)
Keywords: (3GdENJQGYGJs; (3GdYdeGAs; (3GdJQGLes