\documentclass[12pt]{article}
\usepackage{supertabular}


\paperheight    =  297mm        % Standard A4 paper size
\paperwidth     =  210mm        % is 297mm x 210mm

\voffset        = -  1in        % Remove voffset, easier to compute things
\topmargin      =   20mm        % Top of paper to top of header
\headheight     =    6mm        % Size of header
\headsep        =   10mm        % Head to body separation
\textheight     =  220mm        % Height of text of body
\footskip       =    12mm        % Bottom of last lint to bottom of footer
                                % This should leave 2cm at the bottom of the
                                % page (mandatory)

\hoffset        =  - 1in        % Remove hoffset, easier to compute things
\evensidemargin =    18mm        % One-sided => evensidemargin not used
\oddsidemargin  =    18mm        % Mandatory 4cm margin
\textwidth      =  175mm        % Width of text, which leaves the mandatory
                                % 2cm or margin on the right of the text
\marginparsep   =    0mm        % Remove all quantities related to
\marginparwidth =    0mm        % margin notes -- we have no margi
\marginparpush  =    0mm        % notes
\pagestyle{empty}

\begin{document}
\centering

% Put the title of abstract
{\Large{\bf Abstract title goes here}}

\vspace {5mm}
% Put authors given name and surname ( T.=given name, Lho=surname )
{\bf M. Tzamtzi, S. Solomos}\\
% Put the address of affiliation
{\em Institute of Accelerating Systems and Applications (I.A.S.A.), Department of Physics, University of Athens }\\
% Put authors given name and surname
{\bf C. Grentzelou}\\
% Put the address of affiliation
{\em Faculty of Applied Mathematics and Physics , National Technical
University of Athens}


\begin{abstract}
The abstract goes here\\


\end{abstract}

\end{document}
