To cite the spatial point pattern test, please use:

  Andresen M (2009). “Testing for similarity in area-based spatial
  patterns: A nonparametric Monte Carlo approach.” _Applied Geography_,
  *29*(3), 333-345. doi:10.1016/j.apgeog.2008.12.004
  <https://doi.org/10.1016/j.apgeog.2008.12.004>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Testing for similarity in area-based spatial patterns: A nonparametric Monte Carlo approach},
    author = {Martin A. Andresen},
    journal = {Applied Geography},
    year = {2009},
    volume = {29},
    number = {3},
    pages = {333--345},
    doi = {10.1016/j.apgeog.2008.12.004},
  }

To cite sppt_longitudinal(), please also use:

  Andresen M (2026). “Testing longitudinal change in spatial
  distributions and patterns: An extension of the spatial point pattern
  test.” _Annals of the American Association of Geographers_. In press.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Testing longitudinal change in spatial distributions and patterns: An extension of the spatial point pattern test},
    author = {Martin A. Andresen},
    journal = {Annals of the American Association of Geographers},
    year = {2026},
    note = {In press},
  }