Van Hecken, G., Bastiaensen, J. and Huybrechs, F. 2012. Towards an institutional approach of Payments for Environmental Services: perspectives on supply and demand for environmental services from two case studies in the Nicaraguan agricultural frontier. Encuentro. 92 (Oct. 2012), 29–52. DOI:https://doi.org/10.5377/encuentro.v0i92.784.