(3JGQjN GdbQBf hGdJaSjQ (B/s - (3YHOGddg eMehO TMGJgs ((3GdbGgQI (B:s (3GdgjFI GdeUQjI GdYGeI ddcJGH,s, 1972)
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdbQBf s; (3GdTQjYI GdESdGejIs