To cite ggmatplot in publications use:

Liang X, Hui F, Tanaka E, Seimon D (2021). ggmatplot: A quick and easy way of plotting the columns of two matrices or data frames against each other using ggplot2.. https://github.com/xuan-liang/ggmatplot.

Corresponding BibTeX entry:

  @Manual{,
    title = {{ggmatplot}: A quick and easy way of plotting the columns
      of two matrices or data frames against each other using
      ggplot2.},
    author = {Xuan Liang and Francis Hui and Emi Tanaka and Dilinie
      Seimon},
    year = {2021},
    url = {https://github.com/xuan-liang/ggmatplot},
  }