Maintenance cycle and expenses cost of information system security
REN Wei-feng 1,FANG Yong 1,WU Shao-hua 1,XI Mao-jun 1,WU Peng 2
Computer Engineering and Applications . 2008, (26): 88 -89 .  DOI: 10.3778/j.issn.1002-8331.2008.26.027