Xiaolei Li Jin Tian Tingdi Zhao An Improved Zonal Safety Analysis Method and Its Application on Aircraft CRJ200. 461-466 2008 ARES http://doi.ieeecomputersociety.org/10.1109/ARES.2008.81 conf/IEEEares/2008 db/conf/IEEEares/ares2008.html#LiTZ08