To cite varTestnlme in publications use:

Baey C, Kuhn E (2023). “varTestnlme: An R Package for Variance Components Testing in Linear and Nonlinear Mixed-Effects Models.” Journal of Statistical Software, 107(6), 1–32. doi:10.18637/jss.v107.i06.

To cite the associated theoretical paper use:

Baey C, Cournède P, Kuhn E (2019). “Asymptotic distribution of likelihood ratio test statistics for variance components in nonlinear mixed effects models.” Computational Statistics and Data Analysis, 135, 107-122. doi:10.1016/j.csda.2019.01.014.

Corresponding BibTeX entries:

  @Article{,
    title = {{varTestnlme}: An {R} Package for Variance Components
      Testing in Linear and Nonlinear Mixed-Effects Models},
    author = {Charlotte Baey and Estelle Kuhn},
    journal = {Journal of Statistical Software},
    year = {2023},
    volume = {107},
    number = {6},
    pages = {1--32},
    doi = {10.18637/jss.v107.i06},
  }

  @Article{,
    title = {Asymptotic distribution of likelihood ratio test
      statistics for variance components in nonlinear mixed effects
      models},
    author = {Charlotte Baey and Paul-Henry Cournède and Estelle Kuhn},
    year = {2019},
    journal = {Computational Statistics and Data Analysis},
    volume = {135},
    pages = {107-122},
    doi = {10.1016/j.csda.2019.01.014},
  }