1. 4BF - Four Bridges Foru http://www.the4bf.com/ (retrieved May 29, 2009)
2. Alterman, P.: Reformatting Entity CP’s into RFC 3647 Format (November 2006), http://www.cio.gov/fpkipa/documents/PolicyMemoRFC3647v1.pdf (retrieved May 30, 2009)
3. Blaze, M., Feigenbaum, J., Lacy, J.: Decentralized Trust Management. In: IEEE Symposium on Security and Privacy, pp. 164–173 (1996)
4. Bradner, S.: RFC 2119: Key words for use in RFCs to Indicate Requirement Levels (March 1997)
5. Burnard, L., Bauman, S.: TEI P5: Guidelines for Electronic Text Encoding and Interchange, 5th edn (2007)