\documentclass[12pt,a4paper]{amsart}
\usepackage{latexsym}
\usepackage{amsmath,amsthm,amssymb,amsfonts}
\allowdisplaybreaks
\setlength{\textwidth}{16cm} \setlength{\oddsidemargin}{0.25cm}
\setlength{\evensidemargin}{0.25cm} \setlength{\topmargin}{1.2cm}
\linespread{1.3}
\newcommand{\head}{
{\noindent \small II Jaen Conference on Approximation\\ \'{U}beda, June 26 -- July 1, 2011 }
\vspace{10pt}}
\renewcommand{\refname}{Bibliography}
\newtheorem{theorem}{Theorem}
\newtheorem{remark}{Remark}
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{proposition}[theorem]{Proposition}
\newtheorem{corollary}[theorem]{Corollary}
\newtheorem{definition}[theorem]{Definition}
\begin{document}
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\newcommand{\RR}{\mathbb{R}}
\newcommand{\NN}{\mathbb{N}}
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\head \vspace{1.5cm}
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% Insert here the tittle, authors, etc.
% Underline the name of the speaker.
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\title{Insert here the title of the talk}
% underline the speaker
\author{\underline{First author}, Second author and Last author}
\thanks {Insert here, if there exist, the organizations that support your research.}
\maketitle
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% Write here the authors and a short tittle for the headlines
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\markboth{First author, Second author and Last author}{Short title of the talk}
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\begin{center} \textbf{Abstract}
\end{center}
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% Insert here your abstract
% You can use definitions theorems, etc. if you consider it necessary
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Insert here the text of your abstract. Please use the definition included in the template for the usual environments: theorem, lemma, corollary, etc. Also you can make use of the command defined in the template for the real numbers, $\RR$, or natural numbers, $\NN$.
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\textbf{Keywords:} asymptotic formula, shape preserving
approximation, simultaneous approximation, saturation.
\textbf{AMS Classification:} 41A28, 41A40, 41A60.
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% Insert here the Bibliography
% Utilize a format similar to the one that you can see in the following
% examples
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\begin{thebibliography}{99}
\bibitem{Berens} \textbf{H. Berens},
Pointwise saturation of positive operators, {\emph{J. Approx.
Theory}} {\bf 6} (1972) 135--146.
\bibitem{Bonsall} \textbf{F. F. Bonsall},
The Characterization of Generalized Convex Functions,
{\emph{Quart. J. Math. Oxford Ser.(2)}} {\bf 1} (1950) 100--111.
\bibitem{KarlinStudden} \textbf{S. J. Karlin and W. J. Studden},
{\emph{Tchebycheff Systems}}, Interscience, New York, 1966.
\bibitem{jcam} \textbf{A.-J. L\'{o}pez-Moreno and F.-J. Mu\~{n}oz-Delgado,}
Asymptotic expansion of multivariate conservative linear
operators, {\emph{J. Comput. Appl. Math.}} {\bf 150} (2003)
219--251.
\bibitem{LorentzSchumaker} \textbf{G. G. Lorentz and L. L. Schumaker},
Saturation of Positive Operators, {\emph{J. Approx. Theory}} {\bf
5} (1972) 413--424.
\bibitem{Pesin} \textbf{I. Pesin},
\emph{Classical and Modern Integration Theories}, Academic Press,
New York, 1951.
\end{thebibliography}
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\bigskip
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% Insert here the complete addresses of the authors
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{\footnotesize First author,
First author-addres-line 1,
First author-addres-line 2.
email: {\tt firstauthor@xxxxxxx.xxx}
\bigskip
Second author,
Second author-addres-line 1,
Second author-addres-line 2.
email: {\tt secondauthor@xxxxxxx.xxx}
\bigskip
Last author,
Last author-addres-line 1,
Last author-addres-line 2.
email: {\tt lastauthor@xxxxxxx.xxx}
\mbox{ }}
\end{document}