[1] http://users.ece.cmu.edu/~koopman/pubs/koopman14_toyota_ua_s... (look at slide 36)
[2] http://www.networkworld.com/article/2895535/microsoft-subnet...
[3] https://www.ece.cmu.edu/~ece649/lectures/20_sweng_crit_sys.p...
[4] http://www.nytimes.com/2014/05/09/business/recalled-used-car...