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\documentclass[11pt]{article}
\usepackage{latexsym,amssymb,amsmath}

\topmargin 0mm
\oddsidemargin 5mm
\evensidemargin 5mm
\textwidth 150mm
\textheight 662.801 pt

\begin{document}

\begin{center}
{\sf ~\\[14pt]
%%%%%% Please insert TITLE of your talk %%%%%%%

}
\end{center}

%%%%%% Names of authors and their addresses: %%%%%%

\footnotesize{
\begin{center}
AuthorA$^a$, AuthorB$^b$, and AuthorC$^c$\\[14pt]

$^a$AuthorA's address \\[3mm]

$^b$AuthorB's address \\[3mm]

$^c$AuthorC's address
\end{center}
}
%%%%%% (Obvious tweaks for a different number of authors.)

\normalsize
\noindent
%%%%%%% Please insert your ABSTRACT %%%%%%
%%%%%%% Please don't use any nonstandard symbols or fonts. If
%%%%%%% unavoidable, please let us know: remember, our secretarial
%%%%%%% staff will need to deal with a large number of abstracts.

\end{document}
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