1. Al-Hussainy R (1967) Transient flow of ideal and real gases through porous media. PhD thesis, Texas A&M University, College Station
2. Annual Energy Review (AER) (2009) Technical Report DOE/EIA-0384(2008), US Department of Energy, Energy Information Administration, 26 June 2009
3. Avery W, Brown GG, Rosenbranz JA, Wood RK (1992) Optimization of purchase, storage and transmission contracts for natural gas utilities. Oper Res 40(3):446–462
4. Babu BV, Angira R, Chakole PG, Syed Mubeen JH (2008) Optimal design of gas transmission network using differential evolution. http://discovery.bits-pilani.ac.in/discipline/chemical/BVb/RevisedBabRakPalMub%20CIRAS-2003.pdf
5. Bazaraa M, Sherali HD, Shetty CM (2006) Nonlinear programming, 3rd edn. Wiley, New York