\documentclass[11pt,a4paper, twocolumn]{article}
\usepackage[latin1]{inputenc} %% european äöüå characters can be used
\usepackage{times, mathptm}  %% recommended for readable pdf
\pagestyle{empty}  %% no page numbers!
\usepackage{geometry} %% please don't change geometry settings!

\geometry{left=20mm, right=20mm, top=25mm, bottom=25mm, noheadfoot}
%\setcounter{secnumdepth}{-2}
\parindent=0pt
\begin{document}
\title{\textbf{Title of your paper\\
  2 lines if it is long}}
\author{put your name\\
  and your address here}
\date{} % no date              
\maketitle
%%\address{Put your address here}
\thispagestyle{empty} %% needed on 1st page

\abstract{\parindent=0pt

  Please put the abstract of your paper here
  }
\section{Introduction}
We recommend that the paper is in two-column format, but this is no
requirement.



\end{document}