Borchert, Heiko, and Karina Forster. EU and NATO Must Work Together to Guarantee Energy Infrastructure Security and to Define the Role of Soft vs. Hard Power . Brussels: Security Europe, 2007.

Sloan, Stanley R., and Heiko Borchert. "Mind the Three Transatlantic Power Gaps: How a New Framework Can Help Reinvent the Transatlantic Relationship." Connections: The Quarterly Journal  2, no. 3 (2003): 35-49.