Unwanted row breaks in references bibliography

Question

Full Minimal Example Zip File

it's the first time I'm working with LaTex and I have some issues with the bibliography. For some references but not for all, the doi is strangely presented in a new row with a gap. How can I change that? I used a Springer template from here: https://www.springernature.com/gp/authors/campaigns/latex-author-support

Here are relevant information:

\documentclass[sn-apa]{sn-jnl}% APA Reference Style
\bibliography{sn-bibliography}
\bibliographystyle{sn-apacite}%

And here is a picture of the problem:

And here are the entries in my .bib file:

@article{Cousineau2010, 
title={Outliers detection and treatment: a review.}, 
volume={3}, 
url={https://revistas.usb.edu.co/index.php/IJPR/article/view/844}, 
doi = {10.21500/20112084.844}, 
number={1}, 
journal={International Journal of Psychological Research}, 
author={Cousineau, Denis and Chartier, Sylvain}, 
year={2010}, 
pages={58–-67} 
}
@book{Cramer2008,
author = {Cramer, Henriette and Evers, Vanessa and Ramlal, Satyan and {Van Someren}, Maarten and Rutledge, Lloyd and Stash, Natalia and Aroyo, Lora and Wielinga, Bob},
booktitle = {User Modeling and User-Adapted Interaction},
doi = {10.1007/s11257-008-9051-3},
number = {5},
pages = {455--496},
title = {{The effects of transparency on trust in and acceptance of a content-based art recommender}},
volume = {18},
year = {2008},
}

The Cramer reference is of type book.I want no gap between the doi of Cousineau and the rest of the references. If I change the Cousineau reference in my .bib file from article to proceeding, the doi shows correctly. How can I change the settings of article references?

Here is potentially relevant code from the sn-jnl file (line 1685):

\if@APA@refstyle%   
\usepackage[natbibapa]{apacite}%   
\gdef\NumBib{NO}%   
\bibliographystyle{sn-apacite}%  
\def\refdoi#1{\urlstyle{rm}\url{#1}}%   
\renewcommand{\doiprefix}{}%   
\AtBeginDocument{%
\renewcommand{\BPBI}{.}% Period between initials - command from apacite.sty   }%   
\setlength{\bibsep}{1em}%  
\def\bibfont{\reset@font\fontfamily{\rmdefault}
\normalsize\selectfont}%

Please let me know if more information is needed to understand the issue.

Thanks a lot in advance.

Answer 1

Too long for a comment.

Here is a nasty idea. If we look at the generated .bbl file we see

\begin{APACrefURL}
  {https://revistas.usb.edu.co/index.php/IJPR/article/view/844}
  \end{APACrefURL}

with the env being defined in apacite.sty as

\newenvironment{APACrefURL}[1][]{%
  \ifx\@empty#1\@empty
    \BRetrievedFrom % Retrieved from
  \else
    \BRetrieved{#1}%  Retrieved <date>, from
  \fi
}{}

which basically means that the URL part is never given any special formatting. Indeed if we change the URL in the example to contain a _ compilation fails.

But what if we could get the env to read the URL as an argument and then we control the formatting. This requires either a modern LaTeX installation or the xparse package.

\RenewDocumentEnvironment{APACrefURL}{ o m }{
  \IfNoValueTF{#1}{
    \BRetrievedFrom %
  }{
    \BRetrieved{#1} %
  }
  \url{#2}
}{}

This uses \url which is better than nothing.

It does seem that if we also add

\AtBeginDocument{\usepackage{xurl}}

then the URL formatting seems better (slightly better lines breaks, but I still don't think we get the break at any char that xurl might normally bring to the table)

Note that the code used is just the sn-article.tex template from the Springer link.