1. Armas R, Caetano M, Carrão H, Soares A, Pereira MJ, Gutierrez A, Rocha A, Pace G, Zucca C, del Barrio G, Paganini M (2010) Earth observation from space to support the unccd:the Desertwatch Extension project. Paper presented to the Living Planet Symposium, Bergen (Norway), July 1, 2010
2. Brans JP, Mareschal B, Vincke Ph (1984) PROMETHEE: A new family of outranking methods in multi criteria analysis. Journal of Operational Research. 84:477–490
3. Gentile AR (1998) From national monitoring to European reporting: the EEA framework for policy relevant environmental indicators. In: Enne G, d’Angelo M, Zanolla C (eds), Proceedings of the International Seminar on Indicators for Assessing Desertification in the Mediterranean, Porto Torres (Italy) pp 18–20, September, 16-26, 1998
4. Hwang CL, Yoon K (1981) Multiple attributes decision making methods and applications. Springer, New York
5. Kosmas C, Kirkby M, Geeson N (1999) The MEDALUS project Mediterranean desertification and land use; Manual on key indicators of desertification and mapping environmentally sensitive areas to desertification. European Commission, Brussels