[Tex/LaTex] Decreasing space between sections in llncs

lncssectioningspacing

I want to squeeze the space for sections, subsections, and subsubsections on a llncs document. The following can only squeeze subsubsections. How could I squeeze sections and subsections?

   \documentclass{llncs}% http://www.springer.com/computer/lncs?SGWID=0-164-6-793341-0
    \begin{document}
    \section{A section}
    Some text
    \subsection{A subsection}
    Some text
    \subsubsection{A subsubsection}
    Some text
    \subsubsection{Another subsubsection}
    Some text

    \bigskip

    % Put the block below in your LaTeX preamble
    \makeatletter
    \renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}%
                           {-8\p@ \@plus -4\p@ \@minus -4\p@}% Formerly -18\p@ \@plus -4\p@ \@minus -4\p@
                           {-0.5em \@plus -0.22em \@minus -0.1em}%
                           {\normalfont\normalsize\bfseries\boldmath}}
    \makeatother

    \section{A section}
    Some text
    \subsection{A subsection}
    Some text
    \subsubsection{A subsubsection}
    Some text
    \subsubsection{Another subsubsection}
    Some text
    \end{document}

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Best Answer

I have found an answer, just using the following code, can do it 

\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
                       {-8\p@ \@plus -4\p@ \@minus -4\p@}%
                       {6\p@ \@plus 4\p@ \@minus 4\p@}%
                       {\normalfont\large\bfseries\boldmath
                        \rightskip=\z@ \@plus 8em\pretolerance=10000 }}
\renewcommand\subsection{\@startsection{subsection}{2}{\z@}%
                       {-8\p@ \@plus -4\p@ \@minus -4\p@}%
                       {6\p@ \@plus 4\p@ \@minus 4\p@}%
                       {\normalfont\normalsize\bfseries\boldmath
                        \rightskip=\z@ \@plus 8em\pretolerance=10000 }}
\renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}%
                       {-4\p@ \@plus -4\p@ \@minus -4\p@}%
                       {-1.5em \@plus -0.22em \@minus -0.1em}%
                       {\normalfont\normalsize\bfseries\boldmath}}
\makeatother
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