@techreport{murrell-r-clipping-2020,
  title="Improved Clipping in the R Graphics Engine",
  author = {Paul Murrell},
  year={2020},
  note={version 2},
  institution={Department of Statistics, The University of Auckland},
  number={2020-03},
  url={http://stattech.blogs.auckland.ac.nz/2020/06/08/2020-03-improved-clipping-in-the-r-graphics-engine/},
  doi={http://doi.org/10.17608/k6.auckland.12443948}
}