Exploring the relevance and feasibility of PES approaches for producing environmental services through changes in agricultural practices:a case study in the Mekong Region: Vietnam case. - Orange, Didier; Nguyen Duy, P; Loiseau, J.B.; Bui Tan Yen; Henry des Tureaux, Thierry; Bardouin, L.; Rodríguez, C.; Bertrand, J; Grandidier, E; Jouquet, Pascal; Tran Duc Toan (2008)