van Etten J (2017). “R Package gdistance: Distances and Routes on Geographical Grids.” Journal of Statistical Software, 76(13), 21. doi: 10.18637/jss.v076.i13.

Corresponding BibTeX entry:

  @Article{,
    author = {Jacob {van Etten}},
    title = {R Package gdistance: Distances and Routes on Geographical
      Grids},
    doi = {10.18637/jss.v076.i13},
    year = {2017},
    month = {feb},
    publisher = {Foundation for Open Access Statistics},
    volume = {76},
    number = {13},
    pages = {21},
    journal = {Journal of Statistical Software},
  }