To cite package ‘flexFitR’ in publications use:

  Aparicio J, Endelman J (2025). _flexFitR: Flexible Non-Linear Least
  Square Model Fitting_. R package version 1.1.0, ,
  <https://github.com/apariciojohan/flexfitr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {flexFitR: Flexible Non-Linear Least Square Model Fitting},
    author = {Johan Aparicio and Jeffrey Endelman},
    year = {2025},
    note = {R package version 1.1.0, 
},
    url = {https://github.com/apariciojohan/flexfitr},
  }