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Birru, Yitaferu; Hurni, Hans (2008). Pressure-State-Response in Land Resource Changes, Lake Tana Basin, Ethiopia. In: International Conference on Research for Development (ICRD 2008) (p. 1). NCCR North-South
Hurni, Hans; Berhanu, Debele; Gete, Zeleke; Solomon, Abate; Amare, Bantider; Birru, Yitaferu; Ludi, Eva (2008). Land Degradation and Runoff Changes in the Highlands of Ethiopia. In: International Conference on Research for Development (ICRD 2008). Bern, Switzerland. 02.07.-04.07.2008.
