To cite package ‘grex’ in publications use:

  Xiao N, Wang G, Sun L (2024). _grex: Gene ID Mapping for
  Genotype-Tissue Expression (GTEx) Data_. R package version 1.9, ,
  <https://github.com/nanxstats/grex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {grex: Gene ID Mapping for Genotype-Tissue Expression (GTEx) Data},
    author = {Nan Xiao and Gao Wang and Lei Sun},
    year = {2024},
    note = {R package version 1.9, },
    url = {https://github.com/nanxstats/grex},
  }