\documentclass[10pt]{article}

\usepackage{authblk}

\begin{document}

\title{The Title of your Paper}

\author{Author$_1$}
\affil{Affiliation$_1$\\ City$_1$, Country$_1$}

\author{Author$_2$}
\author{Author$_3$}
\affil{Affiliation$_{\{2,3\}}$\\ City$_{\{2,3\}}$, Country$_{\{2,3\}}$}

\date{}

\maketitle

\begin{abstract}
The abstract of your paper...
\end{abstract}

\section{Section}

... This is a citation~\cite{citedpaper}. ...

\subsection*{Subsection}

...

\subsubsection*{Subsubsection}

...

\bibliographystyle{plain}
\bibliography{ldta-2010-template}

\end{document}