1. Phosphorus cycle: a broken biogeochemical cycle;Elser;Nature,2011
2. The story of phosphorus: global food security and food for thought;Cordell;Global Environ. Change,2009
3. World phosphate rock reserves and resources, Research and Development Division;Kauwenbergh;IFDC Muscle Shoals,2010
4. Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions. Closing the Loop–An EU Action Plan for the Circular Economy;EC,2015
5. The global carbon cycle: a test of our knowledge of earth as a system;Falkowski;Science,2000