(3GdSehe GdaWQjI (B: s (3eTcdI RQGYjI HjFjI UMjI (B/ s - (3SYO, eLOj eMH GdOjf eMeOs ((3GdbGgQg (B:s (3GdgjFI GdeUQjI GdYGeI ddcJGH,s, 1991)
Keywords: (3GdSehes