bibentry(
  bibtype = "Article",
  author = as.person("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 = "1-21",
  journal = "Journal of Statistical Software")
