1. American Water Works Association (AWWA). (2004). Interim voluntary security guidance for water utilities Denver CO.
2. Bertinshaw D. and Guesgen H. W. (2004). “Physical approximations for urban fire spread simulations.” Proc. 17th Int. Florida Artificial Intelligence Research Society Conf. FLAIRS Menlo Park CA.
3. Bristow E. C. (2006). “Interdependent infrastructures and multi-mode attacks and failures: Improving the security of urban water systems and fire response.” Ph.D. dissertation Texas A&M Univ. College Station TX.
4. British Broadcasting Corporation (BBC). (2004). “As it happened: Russian school siege.” 〈http://news.bbc.co.uk/2/hi/europe/3624136.stm.〉 (Apr. 19 2012).