将子书目标题格式化为小节

Question

我希望将我的子书目标题格式化为书籍文档类的子部分：

以下是一个例子：

\documentclass[12pt]{book}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage[english]{babel}
\usepackage[autostyle]{csquotes}

\usepackage[backend=biber,style=authoryear]{biblatex}
\addbibresource{example.bib}
\begin{document}

\nocite{*}
\printbibheading
\section*{First category}
\printbibliography[keyword=aaa, heading=subbibliography, title={Subsection1}]
\printbibliography[keyword=bbb, heading=subbibliography, title={Subsection2}]
\section*{Second category}
\printbibliography[keyword=ccc, heading=subbibliography, title={Subsection3}]
\printbibliography[keyword=ddd, heading=subbibliography, title={Subsection4}]
\printbibliography 
\end{document}

使用 example.bib ：

@book{a,
  author       = {Doe, John},
  title        = {Super Book},
  date         = 2006,
  publisher        = {Publisher},
  keywords   = {aaa},
}

@book{b,
  author       = {Sponge, Bob},
  title        = {My Life},
  date         = 2006,
  publisher        = {Publisher},
  keywords   = {bbb},
}

@book{c,
  author       = {Doeee, John},
  title        = {Another Book},
  date         = 2006,
  publisher        = {Publisher},
  keywords   = {ccc},
}

@book{d,
  author       = {Doedoo, John},
  title        = {Book},
  date         = 2009,
  publisher        = {Publisher},
  keywords   = {ddd},
}

结果是：

标题（称为“第 1 节”、“第 2 节”、“第 3 节”和“第 4 节”）默认格式化为节。如何更改？

Answer 1

添加

\defbibheading{subbibliography}[\refname]{\subsection*{#1}}

似乎可以解决问题。