1. Armin Buscher and Thorsten Holz, Tracking DDoS Attacks: Insights into the Business of Disrupting the Web, https: /www. usenix. org/system/files/conference/leet12/leet12-final26. pdf , (2012).
2. Bibai J, Saveant P, Schoenauer M and Vidal V. An Evolutionary Metaheuristic Based on State Decomposition for Domain-Independent Satisfying Planning. 2010. http: /www. aaai. org.
3. Albert-László Barabási. The network takeover. NATURE PHYSICS VOL. 8 JANUARY 2012 www. nature. com/naturephysics.
4. Mark Hopkins. LAYERWIDTH: Analysis of a New Metric for Directed Acyclic Graphs. In Proceedings of the Ninetheenth Conference on Uncertainty in Artificial Intelligence, San Francisco: CA, Morgan Kaufmann Publishers, 321-328, (2003).
5. Roberto Bruni, Fabio Gadducci, Alberto Lluch Lafuente. An Algebra of Hierarchical Graphs and its Application to Structural Encoding. Scientific Annals of computer science, (2010).