Steiner, F., Lana, M. do C., Zoz, T., Frandoloso, J. F. e Fey, R. (2012) “Extraction methods and availability of phosphorus for soybean in soils from Paraná State, Brazil”, Semina: Ciências Agrárias, 33(3), p. 1005–1014. doi: 10.5433/1679-0359.2012v33n3p1005.