Mayaux P., Strahler A., Eva H., Herold M., Shefali A., Naumov S., Dorado A., Di Bella C., Johansson D., Ordoyne C., Kopin I., Boschetti L. and Belward. A. (2006) Validation of the Global Land Cover 2000 Map (2006). IEEE Transactions on Geoscience and Remote Sensing 44: 1728-1739