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@article{hengl04,
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@article{skoien09,
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    url = {http://www.R-project.org/}
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    author = {Nicholas J. Lewin-Koh and Roger Bivand and contributions by Edzer J. Pebesma and Eric Archer and Adrian Baddeley and Hans-JÃ¶rg Bibiko and StÃ©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},
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    author = {Timothy H. Keitt and Roger Bivand and Edzer Pebesma and Barry Rowlingson},
    year = {2011},
    note = {R package version 0.7-1},
    url = {http://CRAN.R-project.org/package=rgdal}
}


% \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.

