OpenCIS - Open Source GIS-based web community information system. - Daniel Caldeweyher; Jinglan Zhang; Binh Pham 001 (Int. J. Geogr. Inf. Sci., 2006)

Open source GIS: a GRASS GIS approach. The international series in engineering and computer science. - Daniel Caldeweyher (Int. J. Geogr. Inf. Sci., 2011)