To cite mstDIF in publications use

  Debelak R, Debeer D (2024). _mstDIF: A Collection of DIF Tests for
  Multistage Tests_. R package version 0.1.8,
  <https://CRAN.R-project.org/package=mstDIF>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{mstDIF}: A Collection of DIF Tests for Multistage Tests},
    author = {Rudolf Debelak and Dries Debeer},
    year = {2024},
    note = {R package version 0.1.8},
    url = {https://CRAN.R-project.org/package=mstDIF},
  }

To describe score-based tests for continuous variables in multistage
tests, cite

  Debelak R, Debeer D (2021). “An Evaluation of DIF Tests in Multistage
  Tests for Continuous Covariates.” _Psych_, *3*(4), 618-638.
  doi:10.3390/psych3040040 <https://doi.org/10.3390/psych3040040>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {An Evaluation of DIF Tests in Multistage Tests for Continuous Covariates},
    author = {Rudolf Debelak and Dries Debeer},
    journal = {Psych},
    year = {2021},
    volume = {3},
    number = {4},
    pages = {618-638},
    doi = {10.3390/psych3040040},
  }