To cite ptmixed in publications use:

Signorelli, M., Spitali, P., Tsonaka, R. (2020). “Poisson-Tweedie mixed-effects model: a flexible approach for the analysis of longitudinal RNA-seq data.” Statistical Modelling. https://doi.org/10.1177/1471082X20936017.

Corresponding BibTeX entry:

  @Article{,
    title = {Poisson-Tweedie mixed-effects model: a flexible approach
      for the analysis of longitudinal RNA-seq data},
    author = {{Signorelli} and {M.} and {Spitali} and {P.} and
      {Tsonaka} and {R.}},
    journal = {Statistical Modelling},
    year = {2020},
    url = {https://doi.org/10.1177/1471082X20936017},
  }