@techreport{murrell-vecpat-2022,
  title="Vectorised Pattern Fills in R Graphics",
  author = {Paul Murrell},
  year={2022},
  note={version 1},
  institution={Department of Statistics, The University of Auckland},
  number={2022-01},
  url={https://stattech.blogs.auckland.ac.nz/2022/06/01/2022-01},
  doi={http://dx.doi.org/10.17608/k6.auckland.19945787}
}