\documentclass[twoside,a4paper]{article}

    \title{Instructions for Preparing an Article}
    \author{Name and Surname\\ e-mail:xyz@mail.server}


    \date{}

    \begin{document}
    \maketitle
    \section{Introduction}
    Introductory text.


    \section{Section number 2}

    You can delete our sample text and replace it with your own
contribution. Equations should be centered and numbered
consecutively,
       \begin{equation}
    \label{eq:myeq1}
    \int_{Q_p}\chi_p(\alpha x^2+\beta x)dx=
\lambda_p(\alpha)|2\alpha|_p^{-1/2} \chi_p \left(
-{\beta^2\over4\alpha} \right), \enskip\alpha\neq 0,
       \end{equation}
 as in Eq.~(\ref{eq:myeq1}).

 Footnotes are denoted by a character superscript
in the text\footnote{Just like this one.}.

The reference list gives the references in the numerical order in
which they are cited in the text. To cite a reference using this
system the reference list number is given within square brackets,
like this \cite{book1}, \cite{review1} or \cite{proc1}.

    \begin{thebibliography}{99}
       \bibitem{book1} V. S. Vladimirov, I. V. Volovich and E. I Zelenov, {\it p-Adic
Analysis and Mathematical Physics}, World Scientific, Singapore,
1994

\bibitem{review1}
L. Brekke and P. G. O Freund, "p-Adic numbers in physics", {\it
Phys. Rep.} {\bf 233} (1993) p. 1

\bibitem{proc1}
G. L. Cardoso, G. Curio, G. Dall'Agata and D. L\"ust,{\it
Heterotic String Compactifications with Fluxes}, Proceedings of
the BW2003WORKSHOP “Mathematical, Theoretical and Phenomenological
Challenges Beyond the Standard Model”, Vrnjacka Banja, Serbia, 29
August - 02 September, 2003, eds. G. Djordjevic, Lj. Ne\v sic and
J. Wess, World Scientific, Singapore (2005) p. 181.

    \end{thebibliography}
    \end{document}
