(3GOH GdWahdI (B: s (3GUhdg (B.. (3eaGgjeg (B.. (3QhGOg (B/ s - (3GMeO RdWs ((3GdbGgQI (B: s (3GdTQcI GdYQHjI ddfTQ hGdJhRjY , s, 1990)
Keywords: (3GdGWaGd ai GdGOHs; (3JGQjN hfbOs