To cite package ‘douconca’ in publications use:

ter Braak C, van Rossum B (2025). douconca: Double Constrained Correspondence Analysis for Trait-Environment Analysis in Ecology. R package version 1.2.2, https://github.com/cajoterbraak/douconca.

Corresponding BibTeX entry:

  @Manual{,
    title = {douconca: Double Constrained Correspondence Analysis for
      Trait-Environment Analysis in Ecology},
    author = {Cajo J.F {ter Braak} and Bart-Jan {van Rossum}},
    year = {2025},
    note = {R package version 1.2.2},
    url = {https://github.com/cajoterbraak/douconca},
  }