%%
%% The LaTeX Companion, 3ed
%%
%% Example 16-7-24 on page II-557 in "Document divisions".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See
https://www.latex-project.org/lppl.txt for details.
%%
\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.0pt}
% Use biber program
\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
{-1.75ex \@plus-1ex \@minus-.2ex}% % bigger than in most examples
{.5ex}%
{\normalfont\large\bfseries}}
\renewcommand\subsection{\@startsection{section}{1}{\z@}%
{-0.75ex \@plus-1ex \@minus-.2ex}%
{.5ex}%
{\normalfont\normalsize\bfseries}}
\makeatother
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage[style=authoryear]{biblatex}
\addbibresource{tlc-ex.bib}
\defbibheading{subbibliography}{%
\subsection*{References for Article
\ref{refsection:\therefsection}}}
%StopShownPreambleCommands
\begin{document}
\section{Article} \newrefsection
\ldots\ \cite{smith2020-1} \ldots
\section{Another article} \newrefsection
\ldots\ \cite{smith2020-2} \ldots
\printbibheading
\bibbysection[heading=subbibliography]
\end{document}
