To cite spind in publications use:

Carl G, Kuehn I (2016) Spind: a package for computing spatially corrected accuracy measures. Ecography<doi:10.1111/ecog.02593>

Corresponding BibTeX entry:

  @Article{,
    title = {Spind: a package for computing spatially corrected
      accuracy measures.},
    author = {Gudrun Carl and Ingolf Kuehn},
    journal = {Ecography},
    year = {2016},
    doi = {10.1111/ecog.02593},
  }