X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSP. - Michael Myers; Rich Ankney; Ambarish Malpani; Slava Galperin; Carlisle Adams (RFC, 1999)

IEEE Internet Computing: Security Track - Public Key Infrastructures that Satisfy Security Goals. - William T. Polk; Nelson E. Hastings; Ambarish Malpani (IEEE Distributed Syst. Online, 2003)

Public Key Infrastructures that Satisfy Security Goals. - William T. Polk; Nelson E. Hastings; Ambarish Malpani (IEEE Internet Comput., 2003)

Server-Based Certificate Validation Protocol (SCVP). - Trevor Freeman; Russell Housley; Ambarish Malpani; David Cooper; W. Timothy Polk (RFC, 2007)

X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSP. - Stefan Santesson; Michael Myers; Rich Ankney; Ambarish Malpani; Slava Galperin; Carlisle Adams (RFC, 2013)