Belkin, P., Nichol, J., & Woehrel, S. (2013). Europe’s energy security: Options and challenges to natural gas supply diversification. Congressional Research Service, 7-5700.
Cabalu, H. (2010). Indicators of security of natural gas supply in Asia. Energy Policy, 38(1), 218-225.
Lochner, S., & Bothe, D. (2009). The development of natural gas supply costs to Europe, the United States and Japan in a globalizing gas market—Model-based analysis until 2030. Energy Policy, 37(4), 1518-1528.
Spanjer, A. (2007). Russian gas price reform and the EU–Russia gas relationship: Incentives, consequences and European security of supply. Energy Policy, 35(5), 2889-2898.