@techreport{murrell-geometry-engine-2019,
  title="A Geometry Engine Interface for 'grid'",
  author = {Paul Murrell},
  year={2019},
  note={version 4},
  institution={Department of Statistics, The University of Auckland},
  number={2019-01},
  url={https://stattech.wordpress.fos.auckland.ac.nz/2019/03/04/2019-01-a-geomet…terface-for-grid/},
  doi={10.17608/k6.auckland.7796831}
}