1. Aarnes A, Just M, Knapskog SJ, Lloyd S, Meijer H. Selecting revocation solutions for PKI. In: Proceedings of the fifth nordic workshop on secure IT systems (NORDSEC); October 2000.
2. Internet X.509 public key infrastructure: certification path building;Cooper,2005
3. Internet X.509 public key infrastructure certificate and certificate revocation list (CRL) profile;Cooper,2008
4. Certificate path validation v1.4;Department of Information Security and Electronic Signature,2006