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How effective is multiple certification in improving the economic conditions of smallholder farmers? : evidence from an impact evaluation in Colombia's coffee belt
Dietz, Thomas; Estrella, Andrea; Grabs, Janina; Kilian, … - In: The journal of development studies 56 (2020) 6, pp. 1141-1160
Persistent link: https://www.econbiz.de/10012260763