1. United Nations International Strategy for Disaster Reduction (UNISDR) Geneva, Switzerland, (2009). Terminology on Disaster Risk Reduction. https://unisdr.org/files/7817_UNISDRTerminologyEnglish.pdf
2. Ford LR, Fulkerson DR (1956) Maximal flow through a network. Can J Math 8:399–404
3. Hoffman AJ (1974) A generalization of max flow - min cut. Math. Prog. 6:352–359
4. McCormick ST (1996) A polynomial algorithm for abstract maximum flow. In Proceeding of the 7th annual ACM-SIAM symposium on discrete algorithms, 490-497
5. Martens M, McCormick ST (2008) A polynomial algorithm for weighted abstract flow. In Integer Programming and Combinatorial Optimization, Lecture Notes in Computer Sciences 5035:97–111