1. http://ceos-sysdb.com/CEOS/.
2. http://www.wmo.int/pages/prog/sat/satellitestatus.php.
3. http://www.disasterscharter.org.
4. William H. Inmon, Building the Data Warehouse, Fourth Edition, Wiley Publishing Inc, 2005.
5. Hoots, Felix R, and Ronald L. Roehrich. Space Track Report No. 3: Models for Propagation of NORAD Element Sets. Peterson: Aerospace Defense Command, United States Air Force, 1980: 1-79.