If you use collin, please cite:

Basagana X, Barrera-Gomez J. Reflection on modern methods: visualizing the effects of collinearity in distributed lag models. International Journal of Epidemiology 2021;51(1):334-344.<doi: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},
  }