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Question

I am trying to run an article using the following references:

@Article{Han_et_al2021a,
    title        = {Controlling the maximum stress in structural stiffness topology optimization of geometrical and material nonlinear structures},
    author       = {Han, Yongsheng and Xu, Bin and Duan, Zunyi and Huang, Xiaodong},
    journal      = {Structural and Multidisciplinary Optimization},
    volume       = {64},
    number       = {6},
    pages        = {3971--3998},
    year         = {2021},
    publisher    = {Springer},
    doi          = {10.1007/s00158-021-03072-1}
}

@Article{Han_et_al2021b,
    title        = {Topology optimization of material nonlinear continuum structures under stress constraints},
    author       = {Han, Yongsheng and Xu, Bin and Wang, Qian and Liu, Yuanhao and Duan, Zunyi},
    journal      = {Computer Methods in Applied Mechanics and Engineering},
    volume       = {378},
    pages        = {113731},
    year         = {2021},
    publisher    = {Elsevier},
    doi          = {10.1016/j.cma.2021.113731}
}

using the Springer template with the following options \documentclass[lineno,pdflatex,sn-mathphys-ay]{sn-jnl}

However, I am achieving the following output: \citet{Han_et_al2021a, Han_et_al2021b}.

instead of Han et al. (2021a); Han et al. (2021b)

I had solved this issue by changing the bibliography style (from sn-mathphys-ay to sn-vancouver).

Thanks in advance!

Answer 1

I assume you're using the Dec. 2024 version of the sn-jnl template and its asssociated .bst ("bibliography style") files. It would appear that there's a bug in the file sn-mathphys-ay.bst that prevents it from creating correct labels if the bibliography contains (at least) two entries with the same first author and the same year. To wit, if I replace

\bibliographystyle{sn-mathphys-ay}%

with

\bibliographystyle{abbrvnat}% % or some other well-known bib style

on line 1672 of the file sn-jnl.cls, I get the following (correct) citation call-out:

Han et al. (2021a,b)

In contrast, if I reinstate sn-mathphys-ay I get

Han et al. (2021,?)

This is precisely what you report in your query as well.

All I can suggest is that you contact the editorial office of the journal or publication you're working with to (a) report that there must be (at least) one bug in sn-mathphys-ay.bst and (b) ask them for some help. Sorry I can't offer more encouraging suggestions.

Finally, the MWE (minimum working example) that I used to verify the existence of the problem -- note that I've drastically simplified the contents of the two entries:

\documentclass[lineno,sn-mathphys-ay]{sn-jnl}
\usepackage{amsmath} % needed to suppress a weird error message

\begin{filecontents}[overwrite]{mybib.bib}
@Article{Han2021a,
    author    = {Han and X and D and H},
    title     = {Abc},
    journal   = {ABC},
    year      = {2021},
    volume    = {5},
    number    = {6},
    pages     = {1--2},
}
@Article{Han2021b,
    author    = {Han and X and W and L and D},
    title     = {Def},
    journal   = {DEF},
    year      = {2021},
    volume    = {7},
    number    = {8},
    pages     = {3--4},
}
\end{filecontents}

\begin{document}
\citet{Han2021a,Han2021b}
\bibliography{mybib}
\end{document}