
%% ================================================================
\begin{thebibliography}{}

%\bibitem[\textbf{DF}]{bib:df}
%D.S.~Dummit and R.M.~Foote.
%\newblock {\em Abstract Algebra} (2nd ed.).
%\newblock John Wiley and Sons, 1999.

%\bibitem[\textbf{FS}]{bib:fs}
%Faddeev and Slavnov.
%\newblock {\em Gauge Fields:  An Introduction to Quantum Theory}.
%\newblock Addison-Wesley, 1994.

\bibitem[\textbf{Fra}]{bib:frankel}
Frankel,~T.
\newblock {\em The Geometry of Physics:  An Introduction} (2nd ed).
\newblock Cambridge University Press, 2004.

%\bibitem[\textbf{Lax}]{bib:lax}
%P.~Lax.
%\newblock {\em Functional Analysis}.
%\newblock Wiley Interscience, 2002.

%\bibitem[\textbf{Lee1}]{bib:lee1}
%J.~Lee.
%\newblock {\em Introduction to Topological Manifolds}.
%\newblock Springer, 2000.

%\bibitem[\textbf{Lee2}]{bib:lee2}
%J.~Lee.
%\newblock {\em Introduction to Smooth Manifolds}.
%\newblock Springer, 2003.

%\bibitem[\textbf{Lee3}]{bib:lee3}
%J.~Lee.
%\newblock {\em Riemannian Manifolds:  An Introduction to Curvature}.
%\newblock Springer, 1997.

%\bibitem[\textbf{Pen}]{bib:penrose}
%R.~Penrose.
%\newblock {\em The Road to Reality:  A Complete Guide to the Laws of the Universe}.
%\newblock Knopf, 2005.

%\bibitem[\textbf{Rot}]{bib:rotman}
%J.J.~Rotman.
%\newblock {\em Advanced Modern Algebra} (2nd printing).
%\newblock Pearson Education, 2002.

%\bibitem[\textbf{Rud}]{bib:rudin}
%Rudin,~W.
%\newblock {\em Principles of Mathematical Analysis} (3rd ed.).
%\newblock McGraw-Hill, 1976.

%\bibitem[\textbf{Spi1}]{bib:spi1}
%M.~Spivak.
%\newblock {\em Calculus on Manifolds}.
%\newblock Perseus, 1965.

%\bibitem[\textbf{Wik}]{bib:wik}
%\newblock Articles
%on \emph{Clifford algebra}
%and \emph{Quadratic form}.
%\newblock \hyperlink
%{http://en.wikipedia.org}
%{http://en.wikipedia.org}.

\end{thebibliography}

