bib file format error

[Thesoul20]

When using latexmk compile the repo, there are error about the bib file:

User
Using METHOD=latexmk
latexmk -xelatex -quiet -halt-on-error -interaction=nonstopmode main
Rc files read:
  /etc/LatexMk
  .latexmkrc
Latexmk: Run number 1 of rule 'xelatex'
This is XeTeX, Version 3.141592653-2.6-0.999994 (TeX Live 2022/Debian) (preloaded format=xelatex)
 restricted \write18 enabled.
entering extended mode
Latexmk: Getting log file 'main.log'
Latexmk: Run number 1 of rule 'bibtex main'
I was expecting a `,' or a `}'---line 1895 of file ref/refs.bib
 :   
 :   publisher={Springer}
(Error may have been on previous line)
I'm skipping whatever remains of this entry
(There was 1 error message)
Collected error summary (may duplicate other messages):
  bibtex main: Bibtex errors: See file 'main.blg'
Latexmk: If appropriate, the -f option can be used to get latexmk
  to try to force complete processing.
make: *** [Makefile:88: main.pdf] Error 12

That is mean there is one error appear at the line of 1895, which is like :

@article{zhang2022new,
  title={{A new method of content distribution based on fuzzy logic and coalition graph games for VEC}},
  author={Zhang, De-gan and Zhu, Hao-li and Zhang, Ting and others},
  journal={Cluster Computing},
  pages={701--717},
  year={2023},
  volum={26}
  publisher={Springer}
}

there is lock of one comma at the volum line. We need to add this to make the repo run successful.

[Thesoul20]

@article{zhang2022new,
  title={{A new method of content distribution based on fuzzy logic and coalition graph games for VEC}},
  author={Zhang, De-gan and Zhu, Hao-li and Zhang, Ting and others},
  journal={Cluster Computing},
  pages={701--717},
  year={2023},
  volum={26},
  publisher={Springer}
}