Poulton, P., Johnston, J., MacDonald, A., White, R., & Powlson, D. (2018). Major limitations to achieving "4 per 1000″ increases in soil organic carbon stock in temperate regions: evidence from long-term experiments at Rothamsted Research, UK. Global Change Biology. https://doi.org/10.1111/gcb.14066 (Original work published 2018)