G.C. Rozzi, zipcodeR: Advancing the analysis of spatial data at the ZIP code level in R, Softw. Impacts. (2021) 100099.

@Article{,
  author = {Gavin C. Rozzi},
  title = {zipcodeR: Advancing the analysis of spatial data at the ZIP code level in R},
  journal = {Software Impacts},
  issn = {2665-9638},
  volume = {9},
  pages = {100099},
  year = {2021},
  doi = {10.1016/j.simpa.2021.100099},
  url = {https://www.sciencedirect.com/science/article/pii/S2665963821000373/},
}