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3. ENISA (2009): Good practice guide on information sharing.
4. Helmbrecht, U., Purser, S., Cooper, G., Ikonomou, D., Marinos, L., Ouzounis, E., Thorbruegge, M., Mitrakas, A., Capogrossi, S. (2013): ENISA: cybersecurity cooperation: defending the digital frontline.
5. ISO (2012): Iso/iec27010: information technology—security techniques—information security management for inter-sector and inter-organizational communications, 2012-03-20.