(3GdGOYGA GdeHGTQ ai GdGLQGAGJ GdLfGFjI(B:s (3OQGSI ebGQfI (B/s - (3ahRjI YHOGdSJGQ (B.s; (3LGeYI GdbGgQI (B.s (3cdjI GdMbhb (B.s ((3GdbGgQI (B:s (3OGQ GdfgVI GdYQHjI (B,s, 1990)
(3WHY HeWHYI LGeYI GdbGgQI hGdcJGH GdLGeYis
Keywords: (3GdbGfhf GdLfGFi s