\begin{thebibliography}{WTM71}

\bibitem[Pel94]{kn:Peldan94}
Peter Peldan.
\newblock Actions for gravity, with generalizations: A review.
\newblock {\em Classical and Quantum Gravity}, 11:1087, 1994.

\bibitem[WTM71]{kn:MisnerThorne&Wheeler}
J.~A. Wheeler, K.~S. Thorne, and C.~W. Misner.
\newblock {\em Gravitation}.
\newblock W. H. Freeman, New York, 1971.

\end{thebibliography}
