\begin{thebibliography}{10}

\bibitem{Nena:911}
{National Emergency Number Association}, ``9-1-1 tutorial.''
  http://www.nena9-1-1.org/desktop/9-1-1%20Tutorial/9-1-1_tutorial.htm.

\bibitem{Telc9705:E911}
Telcordia, ``E9-1-1 service description,'' Special Report SR-4163, Telcordia,
  Morristown, New Jersey, May 1997.

\bibitem{draft-rosenberg-sip-hearingimpaired}
J.~Rosenberg, H.~Schulzrinne, and H.~Sinnreich, ``{SIP} enabled services to
  support the hearing impaired,'' {Internet Draft}, Internet Engineering Task
  Force, July 2000.
\newblock Work in progress.

\bibitem{rfc2365}
D.~Meyer, ``Administratively scoped {IP} multicast,'' Request for Comments
  2365, Internet Engineering Task Force, July 1998.

\bibitem{rfc2142}
D.~Crocker, ``Mailbox names for common services, roles and functions,'' Request
  for Comments 2142, Internet Engineering Task Force, May 1997.

\bibitem{rfc2806}
A.~Vaha-Sipila, ``{URLs} for telephone calls,'' Request for Comments 2806,
  Internet Engineering Task Force, Apr. 2000.

\bibitem{draft-ietf-enum-e164-dns}
P.~Faltstrom, ``{E.164} number and {DNS},'' {Internet Draft}, Internet
  Engineering Task Force, Aug. 2000.
\newblock Work in progress.

\bibitem{draft-zhao-slp-da-interaction}
W.~Zhao, H.~Schulzrinne, and E.~Guttman, ``{mSLP} - mesh-enhanced service
  location protocol,'' {Internet Draft}, Internet Engineering Task Force, Oct.
  2000.
\newblock Work in progress.

\bibitem{rfc2131}
R.~Droms, ``Dynamic host configuration protocol,'' Request for Comments 2131,
  Internet Engineering Task Force, Mar. 1997.

\bibitem{Reed9804:Overview}
J.~H. Reed, K.~J. Krizman, B.~D. Woerner, and T.~S. Rappaport, ``An overview of
  the challenges and progress in meeting the {E-911} requirement for location
  service,'' {\em IEEE Communications Magazine}, Vol.~36, pp.~30--37, Apr.
  1998.

\bibitem{Bahl0003:RADAR}
P.~V. Bahl and V.~Padmanabhan, ``Radar: An in-building rf-based user location
  and tracking system,'' in {\em Proceedings of the Conference on Computer
  Communications (IEEE Infocom)}, (Tel Aviv, Israel), Mar. 2000.

\bibitem{draft-tang-islf-req}
J.~Ruutu, H.~Tang, and J.~Loughney, ``Problems and requirements of some {IP}
  applications based on spatial location information,'' {Internet Draft},
  Internet Engineering Task Force, Feb. 2000.
\newblock Work in progress.

\bibitem{draft-korkea-aho-isl-scenarios}
M.~Korkea-aho, ``Some scenarios for an {ISL} architecture,'' {Internet Draft},
  Internet Engineering Task Force, Mar. 2000.
\newblock Work in progress.

\bibitem{draft-nyckelgard-isl-arch}
S.~Nyckelgard and J.~Loughney, ``{ISL} architectural considerations,''
  {Internet Draft}, Internet Engineering Task Force, Mar. 2000.
\newblock Work in progress.

\bibitem{draft-costanzo-dns-gl}
A.~Costanzo, ``Definition of the {DNS} {GL} resource record used to encode
  geographic locations,'' {Internet Draft}, Internet Engineering Task Force,
  June 2000.
\newblock Work in progress.

\bibitem{rfc1712}
C.~Farrell, M.~Schulze, S.~Pleitner, and D.~Baldoni, ``{DNS} encoding of
  geographical location,'' Request for Comments 1712, Internet Engineering Task
  Force, Nov. 1994.

\bibitem{rfc1876}
C.~Davis, P.~Vixie, T.~Goodwin, and I.~Dickinson, ``A means for expressing
  location information in the domain name system,'' Request for Comments 1876,
  Internet Engineering Task Force, Jan. 1996.

\bibitem{draft-tang-spatial-target}
H.~Tang, ``Target naming scheme,'' {Internet Draft}, Internet Engineering Task
  Force, July 2000.
\newblock Work in progress.

\bibitem{rfc1777}
W.~Yeong, T.~Howes, and S.~Kille, ``Lightweight directory access protocol,''
  Request for Comments 1777, Internet Engineering Task Force, Mar. 1995.

\bibitem{rfc954}
K.~Harrenstien, M.~K. Stahl, and E.~J. Feinler, ``{NICNAME/WHOIS},'' Request
  for Comments 954, Internet Engineering Task Force, Oct. 1985.

\bibitem{rfc1714}
S.~Williamson and M.~Kosters, ``Referral whois protocol (rwhois),'' Request for
  Comments 1714, Internet Engineering Task Force, Nov. 1994.

\end{thebibliography}
