\begin{table}%T2
%\centering
\small
\caption{References to literature data with spectroscopic, astrometric, eclipsing, and visual binaries among the \hipp{} members of \sco{}. The data for a number of binary systems in \sco{} is taken from several catalogues. This table is similar to the one presented in \cite{kouwenhoven2005}, but is updated with recent discoveries.
    \label{table:referencelist}}
  \begin{tabular}{ll}
    \hline 
    \hline 
    Reference & Detection method \\
    \hline
    \cite{alencar2003}     & Spectroscopic \\
    \cite{andersen1993}    & Combination \\
    \cite{balega1994}      & Visual \\
    \cite{barbier1994}     & Spectroscopic\\
    \cite{batten1997}      & Spectroscopic \\ %\cite{batten1989} \\
    \cite{buscombe1962}    & Spectroscopic \\
    \cite{chen2006}        & Visual \\
    \cite{couteau1995}     & Combination\\
    The Double Star Library & Combination\\
    \cite{duflot1995}      &Spectroscopic\\
    \cite{hartkopf2001}    &Visual\\ %\cite{hartkopf1999} \\
    \cite{jilinski2006}    & Spectroscopic \\
    \cite{jordi1997}       &Eclipsing\\
    The \hipp{} and {\em TYCHO} Catalogues &Astrometric\\ 
    \cite{kraicheva1989}   &Spectroscopic\\ %\cite{kraicheva1980} \\
    \cite{kouwenhoven2005} & Visual \\
    \cite{kouwenhoven2007a}& Visual \\
    \cite{lindroos1985}    & Visual \\
    \cite{malkov1993}      &Combination \\
    \cite{mason1995}       &Visual \\
    \cite{mcalister1993}   &Visual\\
    Miscellaneous, e.g. SIMBAD &Combination\\
    \cite{miura1992}       &Visual\\
    \cite{nitschelm2004}   & Spectroscopic \\
    \cite{pedoussaut1996}  &Spectroscopic\\ %\cite{pedoussaut1985} \\
    \cite{shatsky2002}     &Visual\\
    \cite{sowell1993}      &Visual\\
    \cite{svechnikov1984}  &Combination\\
    \cite{tokovininmsc}    &Combination\\
    \cite{wds1997}         &Combination\\
    \hline 
      \end{tabular}
  \end{table}