Primmer E., Paloniemi R., Similä J., Barton D. (2013) Evolution in Finland's Forest Biodiversity Conservation Payments and the Institutional Constraints on Establishing New PolicySociety & Natural Resources: An International Journal 26 (10): 1137-1154. http://www.tandfonline.com/doi/full/10.1080/08941920.2013.820814#.VCugrPmSzmc