(3GdbUI GdQhGjI GdeDda (B: s (3OQGSGJ ai fXQjI GdGfhGY GdGOHjI GdeYGUQI (B/ s - (3cdQ, JhOQha cfJ HjfjJs ((3GdbGgQI (B: s (3OGQ TQbjGJ ddfTQ , s, 1991)
Keywords: (3GdMHcI GdQhGFjIs; (3GdbUI (B- (3JGQjN hfbOs