To cite splm in publications use:

Bivand R, Millo G, Piras G (2021). “A Review of Software for Spatial Econometrics in R.” Mathematics, 9(11). doi:10.3390/math9111276, https://www.mdpi.com/2227-7390/9/11/1276.

Millo G, Piras G (2012). “splm: Spatial Panel Data Models in R.” Journal of Statistical Software, 47(1), 1–38. https://www.jstatsoft.org/v47/i01/.

Corresponding BibTeX entries:

  @Article{,
    title = {A Review of Software for Spatial Econometrics in {R}},
    author = {Roger Bivand and Giovanni Millo and Gianfranco Piras},
    journal = {Mathematics},
    year = {2021},
    volume = {9},
    number = {11},
    url = {https://www.mdpi.com/2227-7390/9/11/1276},
    doi = {10.3390/math9111276},
  }

  @Article{,
    title = {{splm}: Spatial Panel Data Models in {R}},
    author = {Giovanni Millo and Gianfranco Piras},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {47},
    number = {1},
    pages = {1--38},
    url = {https://www.jstatsoft.org/v47/i01/},
  }