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@Manual{neuwirth,
    title = {RColorBrewer: ColorBrewer palettes},
    author = {Erich Neuwirth},
    year = {2011},
    note = {R package version 1.0-5},
    url = {https://CRAN.R-project.org/package=RColorBrewer}
}
@Manual{maptools,
    title = {maptools: Tools for Reading and Handling Spatial Objects},
    author = {Nicholas J. Lewin-Koh and Roger Bivand and Edzer J. Pebesma and Eric Archer and Adrian Baddeley and Hans-J\"{o}rg Bibiko and St\'{e}phane Dray and David Forrest and Michael Friendly and Patrick Giraudoux and Duncan Golicher and Virgilio Gomez Rubio and Patrick Hausmann and Karl Ove Hufthammer and Thomas Jagger and Sebastian P. Luque and Don MacQueen and Andrew Niccolai and Tom Short and Ben Stabler and Rolf Turner},
    year = {2011},
    note = {R package version 0.8-10},
    url = {https://CRAN.R-project.org/package=maptools}
}
@Manual{maps,
    title = {maps: Draw Geographical Maps},
    author = {Ray Brownrigg and Thomas P Minka},
    year = {2011},
    note = {R package version 2.1-6},
    url = {https://CRAN.R-project.org/package=maps}
}
@Manual{rgdal,
    title = {rgdal: Bindings for the Geospatial Data Abstraction Library},
    author = {Timothy H. Keitt and Roger Bivand and Edzer Pebesma and Barry Rowlingson},
    year = {2011},
    note = {R package version 0.7-1},
    url = {https://CRAN.R-project.org/package=rgdal}
}
@BOOK{Illian2008,
  title = {Statistical Analysis and Modelling of Spatial Point Patterns},
  publisher = {Wiley},
  year = {2008},
  author = {Janine Illian and Antti Penttinen and Helga Stoyan and Dietrich Stoyan}
}

% \item G\"{u}ting, R.H., M.H. B\"{o}hlen, M. Erwig, C.S. Jensen,
% N.A. Lorentzos, M. Schneider, and M. Vazirgiannis, A Foundation
% for Representing and Querying Moving Objects.  ACM Transactions on
% Database Systems 25:1 (2000), 1-42.

@article{millo,
  author =	"Giovanni Millo and Gianfranco Piras",
  title =	"splm: Spatial Panel Data Models in R",
  journal =	"Journal of Statistical Software",
  volume =	"47",
  number =	"1",
  pages =	"1--38",
  day =  	"17",
  month =	"4",
  year = 	"2012",
  URL =  	"https://www.jstatsoft.org/v47/i01"
}

@article{jss816,
  title        = "{spacetime}: Spatio-Temporal Data in {R}",
  author       = "Edzer Pebesma",
  journal      = "Journal of Statistical Software",
  year         = "2012",
  volume       = "51",
  number       = "7",
  pages        = "1--30",
  url          = "https://www.jstatsoft.org/v51/i07/"
}