Overview of Certification Systems: X.509, PKIX, CA, PGP and SKIP. Gerck, E. The Bell, 1(3):8, July, 2000.
bibtex   
@article{ ger00,
  author = {Ed Gerck},
  title = {Overview of Certification Systems: X.509, PKIX, CA, PGP and SKIP},
  journal = {The Bell},
  year = {2000},
  month = {July},
  volume = {1},
  number = {3},
  pages = {8},
  uri = {http://www.thebell.net/papers/certover.pdf},
  topic = {x509[0.8] pkix[0.8] pgp[0.8] skip[0.8]}
}

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