1. CGIAR. (2004). SRTM 90 m Digital Elevation Data V4.
2. EAA. (2007). Corine land cover 2000 100 m: Version 9/2007. European Environmental Agency.
3. Application of GPS in Traffic Management Systems
4. FHA. (2013). Traffic monitoring guide. US. Department of Transportation, Federal Highway Administration, Office of Highway Policy Transformation.