\documentclass[12pt,a4paper]{article}
\textwidth16cm
\textheight24.7cm
\oddsidemargin0cm
\topmargin-0.5in
\pagestyle{empty}
\renewcommand{\baselinestretch}{1}
\begin{document}
\begin{center}
%%%%%%%%% ABSTRACT TITLE
{\large{\bf Instructions for Preparation of ISGN-7 Abstract\\(for LaTeX 2e Users)}}
%%%%%%%%% ABSTRACT AUTHORS
\vskip0.5\baselineskip{\bf First A. Author$^{1}$, Second B. Author$^{1,2}$, and Third C. Author${^2}$ }
%%%%%%%%% AFFILIATION
\vskip0.5\baselineskip{\em$^{1}$Institution1, Address1, City1, Country1 \\$^{2}$Institution2, Address2, City2, Country2 }
\end{center}
%%%%%%%%% ABSTRACT BODY
This document provides {\bf LaTeX 2e} version of instructions for preparing an abstract for ISGN-7 and is written in the format according to the guidelines given below. The LaTeX abstract template (source of this file) can be downloaded from ISGN-7 web page: {\em www.unipress.waw.pl/isgn-7/abstracts.html}.

1. The abstract should be prepared as the standard LaTeX 2e 12pt article.  Standard LaTeX 2e packages (e.g. graphicx, wrapfig, babel, \dots) can be used. Author's definitions of macros are allowed, but they must be incorporated into the source tex abstract file. 

2. The abstract must not exceed one page including tables, figures and references.

3. The text composition area (including title and references) for the abstract page is 160 mm wide and 247 mm high. A suggested page setup for A4 paper is 2.5 cm for the left, right, top and bottom margins.  All of the text should fit within the defined composition area.

4. At the top of the page type the title in large, bold Roman font with the first letter of each word capitalized.

5. Leave half line space between the title and the name(s) of the author(s). 

6. Each author's name is to be typed in normalsize (12pt), bold Roman font with the first letter of the name, initials and the first letter of the family name capitalized. The preferred order is "Name" -- "Initials" -- "Family name".

7. For multiple authors from different institutions, identify each author with a superscript number placed after the author's family name.

8. Leave half line space between between the name(s) of the author(s) and the block identifying the name of the institution (plus address, city and country) associated with the each author. The superscript number typed at the end of each author's name should correspond to the superscript number typed at the beginning of the name of the institution with which the author is affiliated. This block is typed in italic, normalsize (12pt) Roman font.

9. The title, author, and institution lines are to be centered.

10. The preferred typeface for the abstract body text is normalsize (12pt) Roman font. The line spacing is to be LaTeX single spacing (baselinestretch=1) and the paragraphs are to be fully justified. 

11. Indicate references (if present), using sequential numbers enclosed in square brackets, e.g. [1]. Include, after the abstract text, a reference list that details the references in the order in which they appear in the abstract. The suggested style is given below. 

12. {\bf Figures} (if present) should be prepared as encapsulated postscript files (.eps). The abstracts will be compiled automatically to final version by Unix computer. The procedure is case sensitive to names of files. Names of figure files will be converted to lower case. MS Windows users should refer figures using lower case English letters and digits. Unix users should use file names in lower case. 

13. The abstract containing figures should be submitted as one archive file. Accepted archives: tar, tar.gz, tgz, tar.bz2, tbz2,  zip. The file size has not exceeded 2MB.
\vskip\baselineskip
\noindent[1] A. B. Auth1, C. D. Auth2, and E. F. Auth3, {\em J. Appl. Phys.} {\bf 50}, 123 (2001).
\end{document} 