` `
GDAL-SOFTWARE-SUITE. Geospatial data abstraction library. http://www.gdal.org, 2013.
GRASS-PROJECT. Geographic ressource analysis support system. http://grass.osgeo.org , 2013.
NETELER, M., AND MITASOVA, H. GIS cu sursă deschisă: O abordare GRASS GIS, 2008.
OGR-SOFTWARE-SUITE. Geospatial data abstraction library. http://www.gdal.org/ogr , 2013.
OPEN-GEOSPATIAL-CONSORTIUM. Web map service (1.1.1) implementation specification. http://portal.opengeospatial.org, 2002.
OPEN-GEOSPATIAL-CONSORTIUM. Web map service (1.3.0) implementation specification. http://portal.opengeospatial.org, 2004.
POSTGIS-PROJECT. Spatial support for postgresql. http://postgis.refractions.net/ , 2013.