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	author = {E. J. Pebesma and R. S. Bivand},
	title = {Classes and methods for spatial data in {R}},
	journal = {{R}-{N}ews},
	volume = 5,
	number = 2,
	year = 2005
}

@inproceedings{aguiar:03,
	title = {Modeling Spatial Relations by Generalized Proximity Matrices},
	author = {A. P. D. Aguiar and G. Camara and A. M. V. Monteiro and R. C. M. de Souza},
	booktitle = {Proceedings of the {V} Brazilian Symposium on Geo{I}nformatics, Geo{I}nfo 2003},
	year = {2003}
}

@InProceedings{terralib,
	author = {G. Camara and R. C. M. de Souza and B. M. Pedrosa and L. Vi\-nhas and A. M. V. Monteiro and J. A. Paiva and M. T. Carvalho and M. Gattass},
    title = {Terra{L}ib: Technology in support of {GIS} innovation.},
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    address = {S\~{a}o Paulo, Brazil},
    year = {2000}
}

