\def\ps@headings{%
       \let\@oddfoot\@empty\let\@evenfoot\@empty
       \def\@evenhead{\underline{\makebox[\textwidth][l]{%
           \sffamily\thepage\hfill\leftmark}}}%
       \def\@oddhead{\underline{\makebox[\textwidth][l]{%
           \sffamily\rightmark\hfill\thepage}}}%
       \let\@mkboth\markboth
     \def\sectionmark##1{%
       \markboth {
         \ifnum \c@secnumdepth >\z@
           \thesection\quad
         \fi
         ##1}{
         \ifnum \c@secnumdepth >\z@
           \thesection\quad
         \fi
         ##1}}%
     \def\subsectionmark##1{}}
 \renewenvironment{abstract}{\section*{\abstractname}%
     \@mkboth{\abstractname}{\abstractname}}{}
 \newenvironment{acknowledgments}{\section*{Acknowledgments}%
     \@mkboth{Acknowledgments}{Acknowledgments}}{}
 \renewcommand\tableofcontents{%
     \section*{\contentsname
         \@mkboth{\contentsname}{\contentsname}}%
     \@starttoc{toc}%
     }
 \renewcommand\listoffigures{%
     \section*{\listfigurename}%
       \@mkboth{\listfigurename}%
               {\listfigurename}%
     \@starttoc{lof}%
     }
 \renewcommand\listoftables{%
     \section*{\listtablename}%
       \@mkboth{\listtablename}%
          {\listtablename}%
     \@starttoc{lot}%
     }
 \renewenvironment{thebibliography}[1]
      {\section*{\refname}%
       \@mkboth{\refname}{\refname}%
       \list{\@biblabel{\@arabic\c@enumiv}}%
            {\settowidth\labelwidth{\@biblabel{#1}}%
             \leftmargin\labelwidth
             \advance\leftmargin\labelsep
             \@openbib@code
             \usecounter{enumiv}%
             \let\p@enumiv\@empty
             \renewcommand\theenumiv{\@arabic\c@enumiv}}%
       \sloppy
       \clubpenalty4000
       \@clubpenalty \clubpenalty
       \widowpenalty4000%
       \sfcode`\.\@m}
      {\def\@noitemerr
        {\@latex@warning{Empty `thebibliography' environment}}%
       \endlist}
 \endinput