\providecommand{\bysame}{\leavevmode\hbox to3em{\hrulefill}\thinspace}
\providecommand{\MR}{\relax\ifhmode\unskip\space\fi MR }
% \MRhref is called by the amsart/book/proc definition of \MR.
\providecommand{\MRhref}[2]{%
  \href{http://www.ams.org/mathscinet-getitem?mr=#1}{#2}
}
\providecommand{\href}[2]{#2}
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\begin{spacing}{1}
\begin{thebibliography}{1}
\vspace{-2pt}

\bibitem{AMS:refs}
American~Mathematical Society, \emph{Guidelines for preparing electronic
  manuscripts ({AMS-LaTeX})}, 1991, available online at \\
  \verb+http://www.math.psu.edu/doc/tex-inputs/author-info/guidelines+.

\bibitem{Gillman:writing}
L.~Gillman, \emph{Writing mathematics well}, Mathematical Association of
  America, Washington, DC, 1987.

\bibitem{Goosens:companion}
{M. Goossens,} {F. Mittelbach,} and {A. Samarin}, \emph{The {LaTeX} companion},
  Addison Wesley, Boston, MA, 1994.

\bibitem{Kopka:guide}
H.~Kopka and P.~Daly, \emph{A guide to {LaTeX}2$\epsilon$}, Addison Wesley,
  Boston, MA, 1995.

\bibitem{Krantz:writing}
S.~G. Krantz, \emph{A primer of mathematical writing}, American Mathematical
  Society, Providence, RI, 1996.

\bibitem{LaTeX3:clsguide}
LaTeX3 Project, \emph{{LaTeX}2$\epsilon$ for class and package writers}, 1995,
  available online at \verb+http://www.latex-project.org/guides/clsguide+.

\bibitem{Steenrod:writing}
{N. E. Steenrod,}~{P. R. Halmos,} {M. M. Schiffer,} and {J. E. Dieudonn\'e},
  \emph{How to write mathematics}, 2nd ed., American Mathematical Society,
  Providence, RI, 1981.

\end{thebibliography}
\end{spacing}