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\documentclass[pdftex,american]{svmult}
\usepackage{amsmath,amssymb,txfonts,bbding} 
\usepackage[numbers,sort]{natbib}  
....
\usepackage[pdftex,plainpages=false,pdfpagelabels,colorlinks=true,
citecolor=black,urlcolor=black,menucolor=black,linkcolor=black, bookmarks=false,pdftitle={vvv},
pdfauthor={xxx}]{hyperref}
\usepackage{lineno}  
\usepackage{pb-diagram} 
\usepackage{epsfig,graphics}  
\usepackage{psfrag} 
\usepackage{times} 
\usepackage{bbold} 
\usepackage{dsfont} 
\usepackage{color} 
\usepackage{booktabs} 
\usepackage{import}  
\usepackage{amsfonts,enumerate}