如何减少参考书目前后的垂直空间

Question

我目前正在使用scrreprt和biblatex来生成我的参考书目。这是我的代码：

\documentclass[12pt]{scrreprt}

\begin{filecontents}{myrefs.bib}
@Book{Knuth:1990,
    author    = {Knuth, Donald E.},
    title     = {The {\TeX}book},
    year      = {1990},
    isbn      = {0-201-13447-0},
    publisher = {Addison\,\textendash\,Wesley},
}

@Book{Lamport:94,
    author    = {Lamport, Leslie},
    title     = {\LaTeX: A Document Preparation System},
    year      = {1994},
    isbn      = {0-021-52983-1},
    publisher = {Addison\,\textendash\,Wesley},
}
\end{filecontents}
\addbibresource{myrefs.bib}

\begin{document}

% here is the text with some references...

% now we create the bibliography
\begingroup
    \begin{onehalfspacing}
        \printbibliography
    \end{onehalfspacing}
\endgroup

\end{document}

效果很好，但是我的文档中标题“参考书目”前后都留有大量空白。我的空间有点受限，我想将所有参考资料放在一页上。有没有办法将标题前后的垂直空间精确调整为特定值？例如 12pt？谢谢您的提示。