@article {Pebesma2007IJGIS,
	title = {{Visualising uncertain spatial and spatio-temporal data under different scenarios: an air quality example}},
	journal = {International Journal of Geographical Information Science},
	volume = {21},
	number = {5},
	year = {2007},
	pages = {515-527},
	author = {Pebesma, E.~J. and de Jong, K. and Briggs, D.~J.}
}