To cite piar in publications use:

Martin S (2024). “piar: Price Index Aggregation in R.” Journal of Open Source Software, 9(101), 6781. doi:10.21105/joss.06781.

Corresponding BibTeX entry:

  @Article{,
    title = {{piar}: Price Index Aggregation in R},
    author = {Steve Martin},
    year = {2024},
    doi = {10.21105/joss.06781},
    journal = {Journal of Open Source Software},
    volume = {9},
    number = {101},
    pages = {6781},
  }