To cite transformGamPoi in publications use:

  Constantin Ahlmann-Eltze and Wolfgang Huber. "Comparison of
  transformations for single-cell RNA-seq data." Nat Methods (2023)

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Comparison of transformations for single-cell {RNA-seq} data},
    author = {Constantin Ahlmann-Eltze and Wolfgang Huber},
    journal = {Nature Methods},
    year = {2023},
    publisher = {Springer Nature},
    url = {https://www.nature.com/articles/s41592-023-01814-1},
    doi = {10.1038/s41592-023-01814-1},
  }