@Manual{R,
    title = {R: A Language and Environment for Statistical Computing},
    author = {{R Core Team}},
    organization = {R Foundation for Statistical Computing},
    address = {Vienna, Austria},
    year = {2019},
    url = {https://www.R-project.org/},
  }

@techreport{murrell-definitions-2020,
  title={Catching Up with {R} Graphics},
  author = {Paul Murrell},
  year={2020},
  note={version 1},
  institution={Department of Statistics, The University of Auckland},
  number={2020-04},
  url={https://stattech.blogs.auckland.ac.nz/2020/07/14/2020-04-catching-up-with-r-graphics/},
  doi={http://dx.doi.org/10.17608/k6.auckland.12649751}
}

@manual{PDF,
title={PDF Reference: Adobe portable document format version 1.4},
author={{Adobe Systems Incorporated}},
edition={3rd},
year={2001},
url={https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/pdf_reference_archives/PDFReference.pdf}
}

@misc{cairo,
  author = {Keith Packard and Carl Worth and Behdad Esfahbod},
  title = {Cairo Graphics Library},
  year = {2021},
  howpublished = {\url{https://www.cairographics.org/}},
  note = {Accessed: 2021-10-24}
}

@techreport{murrell-groups-2021,
  title="Groups, Compositing Operators, and Affine Transformations in {R} Graphics",
  author = {Paul Murrell},
  year={2021},
  note={version 1},
  institution={Department of Statistics, The University of Auckland},
  number={2021-02},
  url={https://stattech.blogs.auckland.ac.nz/2021/11/15/2021-02-groups-compositing-operators-and-affine-transformations-in-r-graphics},
  doi={http://dx.doi.org/10.17608/k6.auckland.17009120}
}

  @Manual{pkg:gridGeometry,
    title = {gridGeometry: Polygon Geometry in 'grid'},
    author = {Paul Murrell},
    year = {2019},
    note = {R package version 0.2-0},
    url = {https://CRAN.R-project.org/package=gridGeometry},
  }