To cite package ‘GMX’ in publications use:

  Alexandrowicz RW (2026). _GMX: Extended Graphical Model Checks for
  the Rasch Family of Models_. R package version 0.9-2.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {GMX: Extended Graphical Model Checks for the Rasch Family of Models},
    author = {Rainer W. Alexandrowicz},
    year = {2026},
    note = {R package version 0.9-2},
  }

  Rainer W. Alexandrowicz (2023). _GMX: Extended Graphical Model Checks
  of RM/PCM/RSM for Multi-Group Splits_. <https://osf.io/2ryd8/>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{GMX}: Extended Graphical Model Checks of RM/PCM/RSM for Multi-Group Splits},
    author = {{Rainer W. Alexandrowicz}},
    year = {2023},
    version = {0.9},
    url = {https://osf.io/2ryd8/},
  }

  Rainer W. Alexandrowicz (2022). “GMX: Extended Graphical Model
  Checks. A Versatile Replacement of the plotGOF() Function of eRm.”
  _Psychological Test and Assessment Modeling_, *64*, 215-225.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {GMX: Extended Graphical Model Checks.
                    A Versatile Replacement of the plotGOF() Function of eRm},
    author = {{Rainer W. Alexandrowicz}},
    journal = {Psychological Test and Assessment Modeling},
    year = {2022},
    volume = {64},
    issue = {3},
    pages = {215--225},
  }

  Rainer W. Alexandrowicz (2023). “Extending GMX: Conditional
  Likelihood Ratio Test and Extended Graphical Model Checks with
  psychotools.” _Psychological Test and Assessment Modeling_, *65*,
  259-269.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Extending GMX: Conditional Likelihood Ratio Test
                    and Extended Graphical Model Checks with psychotools},
    author = {{Rainer W. Alexandrowicz}},
    author = {{Rainer W. Alexandrowicz}},
    journal = {Psychological Test and Assessment Modeling},
    year = {2023},
    volume = {65},
    issue = {2},
    pages = {259--269},
  }