Guilherme Sperb Machado, David Hausheer, Burkhard Stiller: Considerations on the Interoperability of and between Cloud Computing Standards; G2CNet Workshop, Banff, Canada, October 2009, pp 1-4. URL: https://files.ifi.uzh.ch/CSG/staff/machado/extern/publications/ogf27_g2cnet_discussion_cc_standards_finalversion.pdf.