d Versioning (WebDAV) Redirect
              Reference Resources", <a href="./rfc4437">RFC 4437</a>, March 2006.

   [<a name="ref-RFC4791" id="ref-RFC4791">RFC4791</a>]  Daboo, C., Desruisseaux, B., and L. Dusseault,
              "Calendaring Extensions to WebDAV (CalDAV)", <a href="./rfc4791">RFC 4791</a>,
              March 2007.

   [<a name="ref-RFC4918" id="ref-RFC4918">RFC4918</a>]  Dusseault, L., Ed., "HTTP Extensions for Web Distributed
              Authoring and Versioning (WebDAV)", <a href=".