Uusitalo, R., Ekholm, P., Lehtoranta, J., Klimeski, A., Konstari, O., Lehtonen, R. and Turtola, E. 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 (Sep. 2012), 224–236. DOI:https://doi.org/10.23986/afsci.6513.