Ecoregional research for integrated natural research management in Southeast Asian rice ecosystems - Bousquet, Francois; Castella, J.C.; Ekasingh, B.; Hoanh, Chu Thai; Kam, Suan Pheng; Manichon, H.; Ni, D.V.; Quang, D.D.; Trébuil, Guy; To Phuc Tuong (CGIAR Challenge Program on Water and Food, 2006)