Print list of non-cited bibliography entries without citation keys

Question

I am using biblatex with the added feature of adding all cited references to their own category:

\DeclareBibliographyCategory{cited}
\AtEveryCitekey{\addtocategory{cited}{\thefield{entrykey}}}

as shown here. Now consider this MWE:

\documentclass{scrreprt}

\usepackage[refsegment=chapter]{biblatex}
    \DeclareBibliographyCategory{cited}%so we can access all non-cited as own category
    \AtEveryCitekey{\addtocategory{cited}{\thefield{entrykey}}}

\begin{filecontents}{thebib.bib}
@misc{mathworks_constant_2018,
    type = {Documentation},
    title = {Constant volume pneumatic chamber based on ideal gas law},
    url = {https://uk.mathworks.com/help/physmod/simscape/ref/constantvolumepneumaticchamber.html},
    urldate = {2022-01-01},
    journal = {Mathworks Simulink Documentation},
    author = {{Mathworks}},
    year = {2018},
}
@online{WinNT,
  author = {MultiMedia LLC},
  title = {{MS Windows NT} Kernel Description},
  year = 1999,
  url = {http://web.archive.org/web/20080207010024/http://www.808multimedia.com/winnt/kernel.htm},
  urldate = {2010-09-30}
}
\end{filecontents}
\addbibresource{thebib.bib}

\usepackage{cleveref}

\begin{document}
    \chapter{This is a chapter}
    \autocite{mathworks_constant_2018}
    \endrefsegment%anything after not in any segment -> not printed by bibbysegment
    \nocite{*}%
    \printbibheading%print big heading once
    \defbibheading{subbibliography}{\vspace*{1.5\baselineskip}\section*{\Cref{refsegment:\therefsection\therefsegment}}}%
    \bibbysegment[heading=subbibliography]%cycle through all segments and print
    \defbibheading{notcited}{\section*{Further Reading}}
    \printbibliography[notcategory=cited, heading=notcited]
\end{document}

with an example inspired in parts by this question.

The \defbibheading with cleveref is a redefinition to allow clickable links. It is not part of the example, but I left it in so nothings breaks. I left hyperref out so they don't show. The result is:

Is there a way to remove citation keys – in this case [1] – from the Further Reading section?

Since no entries there are cited anywhere, we do not need citation keys there. It is just meant as a list for anyone who cares.

Answer 1

You can define a new bibliography environment for the further reading section. I just copied the definition from authoryear.bbx as that gives a reasonably pleasant result. You will also want to use the option defernumbers to make sure that the numbering comes out as expected (you could also add the option omitnumbers to the \printbibliography command of the further reading section, though that would not change the output here; there would only be a difference if further reading is followed by another numbered \printbibliography with entries that have not appeared before).

\documentclass{report}

\usepackage[refsegment=chapter, defernumbers=true]{biblatex}
\usepackage{cleveref}

\DeclareBibliographyCategory{cited}
\AtEveryCitekey{\addtocategory{cited}{\thefield{entrykey}}}

\defbibheading{subbibliography}{%
  \section*{\Cref{refsegment:\therefsection\therefsegment}}}

\defbibheading{notcited}{\section*{Further Reading}}

\defbibenvironment{bibnonum}
  {\list
     {}
     {\setlength{\leftmargin}{\bibhang}%
      \setlength{\itemindent}{-\leftmargin}%
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}}}
  {\endlist}
  {\item}

\begin{filecontents}{\jobname.bib}
@misc{mathworks_constant_2018,
  type    = {Documentation},
  title   = {Constant volume pneumatic chamber based on ideal gas law},
  url     = {https://uk.mathworks.com/help/physmod/simscape/ref/constantvolumepneumaticchamber.html},
  urldate = {2022-01-01},
  journal = {Mathworks Simulink Documentation},
  author  = {{Mathworks}},
  year    = {2018},
}
@online{WinNT,
  author  = {MultiMedia LLC},
  title   = {{MS Windows NT} Kernel Description},
  year    = 1999,
  url     = {http://web.archive.org/web/20080207010024/http://www.808multimedia.com/winnt/kernel.htm},
  urldate = {2010-09-30}
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
  \chapter{This is a chapter}
  \autocite{mathworks_constant_2018}

  \endrefsegment
  \nocite{*}
  \printbibheading
  \bibbysegment[heading=subbibliography]
  \printbibliography[notcategory=cited, env=bibnonum, heading=notcited]
\end{document}

I had to use report instead of scrreprt because of https://github.com/plk/biblatex/issues/857 to make the MWE work for me. I also removed the \vspace*{1.5\baselineskip}% for the MWE as I wanted to avoid the excessive space it introduces with the standard class.