To cite package ‘simpletex’ in publications use:

  Chu X (2024). _simpletex: Mathematical Formulas and Character
  Recognition_. R package version 1.0.4,
  <https://gitlab.com/chuxinyuan/simpletex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {simpletex: Mathematical Formulas and Character Recognition},
    author = {Xinyuan Chu},
    year = {2024},
    note = {R package version 1.0.4},
    url = {https://gitlab.com/chuxinyuan/simpletex},
  }