Community harvesting of trees in Tanzania under payments for ecosystem services (PES) schemes: Results of economic games in selected communities in Tanzania - Claudia Lopez, M.; Torres, S.; Naftal, B.; Kopa, A.; Julius, R.; Samweli, T.; Mwabulambo, R.; Samweli, J.; Kingazi, G.; Mwangi, E.; Andersson, K. (Center for International Forestry Research, 2016)