Uusitalo, Risto, Petri Ekholm, Jouni Lehtoranta, Aleksandar Klimeski, Olli Konstari, Riku Lehtonen, and Eila Turtola. 2012. “Ca–Fe Oxide Granules As Potential Phosphate Barrier Material for Critical Source Areas: A Laboratory Study of P Retention and Release”. Agricultural and Food Science 21 (3):224-36. https://doi.org/10.23986/afsci.6513.