Ekholm, Petri, Pasi Valkama, Elina Jaakkola, Mikko Kiirikki, Kirsti Lahti, and Liisa Pietola. 2012. “Gypsum Amendment of Soils Reduces Phosphorus Losses in an Agricultural Catchment”. Agricultural and Food Science 21 (3), 279-91. https://doi.org/10.23986/afsci.6831.