\NeedsTeXFormat{LaTeX2e}
\documentclass[11pt]{phys} 
\textwidth15cm
\textheight21cm
\oddsidemargin0.5cm 
\evensidemargin0.5cm
%\topmargin
\usepackage[pctex32]{graphics}
\usepackage {graphicx}
\usepackage{amsmath,amsxtra,amssymb,latexsym, amscd}
\usepackage[mathscr]{eucal}
\renewcommand\refname{\normalsize \centerline{ REFERENCES}}
\input setbmp
\input seteps
\input setwmf
\input setps
\def\vsa{\vskip-0.2cm}
\def\va{\vskip-0.02cm}
\def\vssa{\vskip-0.4cm}
\def\vs{\vskip0.2cm}
\def\vsm{\vskip0.1cm}
\def\vss{\vskip0.4cm}
%
\def\bce{\begin{center}}
\def\ece{\end{center}}
%
\def\beq{\begin{equation}}
\def\eeq{\end{equation}}
\def\bea{\begin{eqnarray}}
\def\eea{\end{eqnarray}}
\def\e{\epsilon}
\def\s{\sigma}
\def\({\left(}
\def\){\right)}
\def\ti{\tilde}
\def\l{\lambda}
\def\ra{\rangle}
\def\la{\langle}
\def\d{\delta}
\def\m{\mu}
\def\n{\nu}
\def\n{\noindent}
\def\nn{\nonumber}
\def\ce{\centerline}
\def\bceb{\begin{center}\vsa}
\def\eceb{\vsa \end{center}}
\def\bbceb{\begin{center}\vssa}
\def\beceb{\vssa \end{center}}
\def\disp{\displaystyle}
