Jon Wakefield, Nicky Best, Sebastien Haneuse, and Albert Y. Kim
References
Bivand, R. S., Pebesma E. J., and Gomez-Rubio V. (2008) Applied Spatial Data Analysis with R. Springer Series in Statistics.
E. J. Pebesma and R. S. Bivand. (2005) Classes and methods for spatial data in R. R News, 5, 9--13.