To cite quantregGrowth in publications use:

V.M.R. Muggeo, F. Torretta, P. Eilers, M. Sciandra, M. Attanasio (2021). “Multiple smoothing parameters selection in additive regression quantiles.” Statistical Modelling, 21, 428–448. https://journals.sagepub.com/doi/full/10.1177/1471082X20929802.

V.M.R. Muggeo, M. Sciandra, A. Tomasello, S. Calvo (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 = {2021},
    volume = {21},
    pages = {428--448},
    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},
  }