(3GdKhQI GdLRGFQjI h GdGYdGe (B:s (3OQGSI aj GdGYdGe GdKhQj (B/s - (3MeOj , CMeO s ((3GdLRGFQ (B:s (3OjhGf GdeWHhYGJ GdLGeYjI ,s, 1990)
Keywords: (3GdGYdGe s; (3GdKhQI s; (3GdLRGFQjI s