S. Stolfo, G. Creamer, and S. Hershkop. DG.O, volume 151 of ACM International Conference Proceeding Series, page 23-24. Digital Government Research Center, (2006)
G. Creamer. Complex, volume 126 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 83-94. Springer, (2012)