%%
%% The LaTeX Companion, 3ed
%%
%% Example 12-3-29 on page II-249 in "newpxmath --- Using the PX fonts for math".
%%
%% 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{351.0pt}
%StartShownPreambleCommands
\usepackage[upint]{newpxmath}
%StopShownPreambleCommands

\begin{document}
\[ \smallint \smalliint \smalliiint \smalliiiint \smalloint \smalloiint \smalloiiint
 \smallvarointclockwise \smallointctrclockwise \smallfint \smallsumint \smallsqint
 \qquad
  \smallintsl \smalliintsl \smalliiintsl \smalliiiintsl \smallointsl \smalloiintsl \smalloiiintsl
 \smallvarointclockwisesl \smallointctrclockwisesl \smallfintsl \smallsumintsl \smallsqintsl
 \]
\end{document}