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To cite pgt in publications use:

Enstad E (2026). pgt: Data Envelopment Analysis for Pollution-Generating Technologies. R package version 0.5.0, https://github.com/iik1/pgt.

Please also cite the methodological papers behind the estimators you use; see the references in ?pgt.

Corresponding BibTeX entry: 

  @Manual{,
    title = {pgt: Data Envelopment Analysis for Pollution-Generating
      Technologies},
    author = {Erik Enstad},
    year = {2026},
    note = {R package version 0.5.0},
    url = {https://github.com/iik1/pgt},
  }

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