(3MeGjI GdMjGI GdNGUI aj GdbGfhf GdLfGFj (B: s (3OQGSI ebGQfI (B/ s - (3HMQ , eeOhM Ndjd s ((3GdbGgQI (B: s (3OGQ GdfgVI GdYQHjI , s, 1983)
Keywords: (3GdbGfhf GdLfGFj s