\begin{thebibliography}{Cup05}

\bibitem[Cup05]{cuppaidge05}
George Cuppaidge.
\newblock Wolff sign-off revisited.
\newblock The {QBA} Bulletin, page~5, January 2005.
\newblock http://www.qldbridge.com/bulletin/QBAJan05.pdf.

\bibitem[Far02]{farebrother02}
Michael Farebrother.
\newblock The raptor, or polish, {1NT} overcall.
\newblock August 2002.
\newblock http://biomass.to/mycroft/bridge/Raptor1NT.html.

\bibitem[Ret04]{retzlaff04}
Ralph Retzlaff.
\newblock Wehren {S}ie sich!
\newblock Bridge Magazin, pages 35--36, September 2004.

\bibitem[Smi]{smithtrf}
Marc Smith.
\newblock Transfer advances.
\newblock Number 29--30 in Bridge Plus Features.
\newblock http://www.bridgeguys.com/pdf/SmithTransferAdvances.pdf.

\end{thebibliography}
