1. EGI e-Infrastructure Homepage.
www.egi.eu
. Accessed 30 Apr 2019
2. eduGAIN Homepage.
https://edugain.org/
. Accessed 30 Apr 2019
3. The AARC project Homepage.
https://aarc-project.eu
. Accessed 30 Apr 2019
4. EGI Accounting Portal.
https://accounting.egi.eu/
. Accessed 30 Apr 2019
5. Adams, C., Lloyd, S.: Understanding PKI: Concepts, Standards, and Deployment Considerations, pp. 11–15. Addison-Wesley Professional (2003). ISBN 978-0-672-32391-1