If you use collin, please cite:

Basagaña X, Barrera-Gómez J (2021). “Reflection on modern methods: visualizing the effects of collinearity in distributed lag models.” International Journal of Epidemiology, 51(1), 334–344. doi:10.1093/ije/dyab179, https://doi.org/10.1093/ije/dyab179.

Corresponding BibTeX entry:

  @Article{,
    title = {Reflection on modern methods: 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},
    volume = {51},
    number = {1},
    pages = {334--344},
    doi = {10.1093/ije/dyab179},
    url = {https://doi.org/10.1093/ije/dyab179},
  }