@misc{rfc793,
  shorthand="RFC793",
  presort="RFC0793",
  author="J. Postel",
  title="{Transmission Control Protocol}",
  series="Request for Comments",
  number="793",
  howpublished="RFC 793 (Standard)",
  publisher="IETF",
  organization="Internet Engineering Task Force",
  year=1981,
  month=sep,
    note="Updated by RFCs 1122, 3168, 6093, 6528",
  url="http://www.ietf.org/rfc/rfc793.txt",
}