To cite the 'collin' package in publications use:

Basagaña X, Barrera-Gómez J (2021 (under review)). “Visualizing the effects of collinearity in distributed lag models.” International Journal of Epidemiology. https://academic.oup.com/ije/.

Corresponding BibTeX entry:

  @Article{,
    title = {Visualizing the effects of collinearity in distributed lag
      models},
    author = {Xavier Basaga\~na and Jose Barrera-G\'omez},
    journal = {International Journal of Epidemiology},
    year = {2021 (under review)},
    url = {https://academic.oup.com/ije/},
  }