Biblatex no extra line, in case of equal initial letters

Question

My Bibliography is arranged like in the example beneath. So the equal initial letters are merged together (without extra line in between). How I'm able to have an extra line in any cases?
    Kieviet, André (Lean Digital Transformation, 2019): Lean Digital Transformation: Ge­ schäftsmodelle transformieren, Kundenmehrwerte steigern und Effizienz erhöhen, Wies­ baden, 2019

Prof. Dr. Bonin, Holer, Dr. Gregory, Terry, Dr. Zierahn, Ulrich (Übertragung auf Deutsch­ land, 2015): Übertragung der Studie von FreyOsborne 2013 auf Deutschland, in: Kurz­ expertise (2015), Nr. 57
    Prof. Dr. Kagermann, Henning, Prof. Dr. Wahlster, Wolfgang, Dr. Helbig, Johannes, M.A. Hellinger, Ariane, M.A. Stumpf, Veronika (Digitalisierung Industrie, 2013): Di­ gitalisierung der Industrie – Die Plattform Industrie 4.0, Frankfurt am Main, 2013

Rische, Marie­Christin, Vöpel, Henning (Digitalökonomie, 2016): Schwerpunkt Kreative Zerstörung 4.0 ­ Die Neuvermessung der Welt ­ Grundprinzipien und Konsequenzen der Digitalökonomie, in: Wirtschaftspolitische Blätter (2016), Nr. 2

usepackage[
    backend=biber,
    style=ext-authoryear,
    maxcitenames=3,
    maxbibnames=999,
    mergedate=false,
    date=iso,
    seconds=true,
    urldate=iso,
    innamebeforetitle,
    dashed=false,
    autocite=footnote,
    doi=false,
    useprefix=true,
    mincrossrefs = 1
]{biblatex}
input{modBib}
...
printbibliography[nottype=online,heading=bibintoc,title={Literaturverzeichnis}]

moewe · Accepted Answer

biblatex has three parameters to adjust the spacing between entries (§3.11.4 Lengths and Counters, p. 131, v3.15a of the biblatex documentation).

bibitemsep is the space inserted between individual entries.
bibnamesep is the space inserted between entries by different authors/editors.
bibinitsep is the space inserted between entries with different initial letter of the authors/editors.

Note that if several of those spaces would apply between two entries, the largest space wins. The spaces are not added.
The result you describe in the question looks like the result of setting bibinitsep to a non-zero value, e.g.
documentclass[british]{article}
usepackage[T1]{fontenc}
usepackage{babel}
usepackage{csquotes}

usepackage[backend=biber, style=authoryear]{biblatex}

setlength{bibinitsep}{2itemsep}

addbibresource{biblatex-examples.bib}

begin{document}
Lorem autocite{sigfridsson,nussbaum,knuth:ct:a,
  knuth:ct:b,kastenholz,aksin,herrmann}

printbibliography
end{document}

You can change this by setting bibnamesep to 0. If you want more space between all entries, set bibitemsep to a larger value.

dhd80 · Answer

Thanks a lot moewe, you nailed it. It works fine with bibitemsep instead of bibinitsep, if this will help someone, someday I set: setlength{bibitemsep}{0.75cm}. Also thanks for the hint about academic titles, I will double check this one.

Answered by dhd80 on January 1, 2021

Biblatex no extra line, in case of equal initial letters

2 Answers

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