To cite the varTestnlme R package:

Baey C, Kuhn E (2019). “varTestnlme: variance components testing in mixed-effect models.” https://github.com/baeyc/varTestnlme.

To cite the associated theoretical paper:

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:

  @Misc{,
    title = {varTestnlme: variance components testing in mixed-effect
      models},
    author = {Charlotte Baey and Estelle Kuhn},
    year = {2019},
    url = {https://github.com/baeyc/varTestnlme},
  }

  @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},
  }