Umbach, Frank, and Maximilian Kuhn. "Unconventional Gas Resources:A Transatlantic Shale Alliance?" In Transatlantic Energy Futures: Strategic Perspectives on Energy Security, Cli¬mate Change and New Technologies in Europe and the United States. Washington, D.C.: Center for Transatlantic Relations, Johns Hopkins University?SAIS, 2012.

Kuhn, Maximilian, and Frank Umbach. The Geoeconomic and Geopolitical Implications of Unconventional Gas in Europe. Journal of Energy Security, 2011.

Nerlich, Uwe, and Frank Umbach. "European Energy Infrastructure Protection: Addressing the Cyber-warfare Threat." Journal of Energy Security (2009).