(3SGWY GdMUQi (B: s (3KdGKhf YGeG Ydi GdQMjd (B/ s - (3YHOGddg YHOGdOGFes; (3GMeO jhSa GMeOs ((3GdbGgQI (B: s (3eQcR OQGSGJ GdhMOI GdYQHjI , s, 1999)
Keywords: (3GdSjGSIs; (3GdhMOI GdYQHjIs; (3GdbhejI GdYQHjIs; (3SGWY GdMUQis