\documentclass[a4paper,12pt]{article}
\usepackage{amssymb,amsmath,latexsym,enumerate,url}
\pagestyle{empty}

\newcommand{\bcctitle}[1]{{\large #1}\\[3mm]}
\newcommand{\bccauthor}[1]{{\textbf{#1}}\\[3mm]}
\newcommand{\joint}[1]{{#1}\\[3mm]}
\newcommand{\msc}[1]{#1}
\newcommand{\bccabstract}[1]{\bigskip#1}
\newcommand{\bccemail}[1]{\def\ema{\texttt{#1}\\[3mm] \indent}}
\newcommand{\affiliation}[1]{\def\aff{\small #1}}

\begin{document}
%Please use the macros below for your title, name and other information. This
%will help the organizers to process your abstract.

\begin{center}
\bcctitle{Title}
\bccauthor{A. N. Author}
\joint{joint work with ??} 
	%If relevant, otherwise delete this line
\msc{MSC2010 headings}     
	%Please give between one and three headings from the 2010 MSC,
    %putting the most relevant first: http://www.ams.org/mathscinet/msc/msc2010.html
\end{center}

\bccemail{a.author@x.y.z}
\affiliation{Your department}
	%Your email address and affiliation will appear in the book of abstracts issued
	%at the conference

\bccabstract{
Add abstract here. Please do not use more than 20 lines, or three
paragraphs, in your abstract.

%References are not required. If you give any please use the format below.
%Please do not use the LaTeX bibliography environment or BiBTeX.

\vspace{2mm}
\noindent \textbf{References.}\\[2mm]
[1] A. N. Author, Title, \emph{Journal} \textbf{vol} (year)
100-200.\newline
[2] A. N. Author, Title II, \emph{preprint} \url{www.google.com}.,
}

\vfill\ema\aff

\end{document}