To cite quantregGrowth in publications use:

Muggeo V, Torretta F, Eilers P, Sciandra M, Attanasio M (2020). “Multiple smoothing parameters selection in additive regression quantiles.” Statistical Modelling, xx, xx–xx. https://journals.sagepub.com/doi/full/10.1177/1471082X20929802.

Muggeo V, Sciandra M, Tomasello A, Calvo S (2013). “Estimating growth charts via nonparametric quantile regression: a practical framework with application in ecology.” Environmental and Ecological Statistics, 20, 519–531.

Corresponding BibTeX entries:

  @Article{,
    title = {Multiple smoothing parameters selection in additive
      regression quantiles},
    author = {V.M.R. Muggeo and F. Torretta and P. Eilers and M.
      Sciandra and M. Attanasio},
    journal = {Statistical Modelling},
    year = {2020},
    volume = {xx},
    pages = {xx--xx},
    url =
      {https://journals.sagepub.com/doi/full/10.1177/1471082X20929802},
  }

  @Article{,
    title = {Estimating growth charts via nonparametric quantile
      regression: a practical framework with application in ecology},
    author = {V.M.R. Muggeo and M. Sciandra and A. Tomasello and S.
      Calvo},
    journal = {Environmental and Ecological Statistics},
    year = {2013},
    volume = {20},
    pages = {519--531},
  }