Supplementary_materials - Farmers’ adoption of agricultural innovations: A systematic review on willingness to pay studies OlumSolomon GellynckXavier JuvinalJoel OngengDuncan De SteurHans 2019 <p>Supplementary_materials for Farmers’ adoption of agricultural innovations: A systematic review on willingness to pay studies by Solomon Olum, Xavier Gellynck, Joel Juvinal, Duncan Ongeng and Hans De Steur in Outlook on Agriculture</p>