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I'm using bibunit to enter multiple bibliographies in a document. I don't want the bibunit to have a separate heading. I can remove the text with by redefining refname, but this still leaves big vertical space. How can I drop that space entirely?

Here's a toy example:

documentclass{article}

usepackage{bibunits}

begin{document}



defaultbibliographystyle{plainyr-rev}

defaultbibliography{ab,ty2}

renewcommand{refname}{}



section{Publications}



Some text goes here.



begin{bibunit}

  nocite{smith_douglas_ea_2004}

  putbib

end{bibunit}

end{document}

This produces:

I've drawn a red line on the image to show the space I want to reduce/eliminate.

A hack specific for the article class. Other classes may require different workarounds:

documentclass{article}

usepackage{bibunits}



%%% START HACK

usepackage{etoolbox}

AtBeginEnvironment{bibunit}{renewcommandsection[5]{}}

%%% END HACK



begin{document}



defaultbibliographystyle{plainyr-rev}

defaultbibliography{ab,ty2}



section{Publications}



Some text goes here.



begin{bibunit}

  nocite{smith_douglas_ea_2004}

  putbib

end{bibunit}

end{document}

Explanation: the code for the thebibliography environment starts with

newenvironment{thebibliography}[1]

     {section*{refname}%

      @mkboth{MakeUppercaserefname}{MakeUppercaserefname}%

      list{@biblabel{@arabicc@enumiv}}%

      [...]

and the redefinition of section we perform when bibunits starts gobbles section together with the five "arguments" that follow:

*

{refname}

@mkboth

{MakeUppercaserefname}

{MakeUppercaserefname}

A cleaner approach would be to redefine the environment:

makeatletter

renewenvironment{thebibliography}[1]

     {list{@biblabel{@arabicc@enumiv}}%

           {settowidthlabelwidth{@biblabel{#1}}%

            leftmarginlabelwidth

            advanceleftmarginlabelsep

            @openbib@code

            usecounter{enumiv}%

            letp@enumiv@empty

            renewcommandtheenumiv{@arabicc@enumiv}}%

      sloppy

      clubpenalty4000

      @clubpenalty clubpenalty

      widowpenalty4000%

      sfcode`.@m}

     {def@noitemerr

       {@latex@warning{Empty `thebibliography' environment}}%

      endlist}

makeatother

removing the code responsible for the section* command.

You can also do

renewcommand{refname}{vspace*{-21pt}}

adjusting 21 to your liking.