The software package:

Nuske R (2024). “apcf: Adapted Pair Correlation Function.” doi:10.5281/zenodo.2535612.

The article describing the method:

Nuske RS, Sprauer S, Saborowski J (2009). “Adapting the pair-correlation function for analysing the spatial distribution of canopy gaps.” Forest Ecology and Management, 259(1), 107-116. doi:10.1016/j.foreco.2009.09.050.

Corresponding BibTeX entries:

  @Misc{,
    title = {apcf: Adapted Pair Correlation Function},
    author = {Robert Nuske},
    license = {GPL-3.0-or-later},
    year = {2024},
    version = {0.3.1},
    doi = {10.5281/zenodo.2535612},
  }

  @Article{,
    title = {Adapting the pair-correlation function for analysing the
      spatial distribution of canopy gaps},
    author = {Robert S. Nuske and Susanne Sprauer and Joachim
      Saborowski},
    journal = {Forest Ecology and Management},
    volume = {259},
    number = {1},
    pages = {107-116},
    year = {2009},
    doi = {10.1016/j.foreco.2009.09.050},
  }