Gonçalves, Marcos Aparecido, et al. “Soil Differentiation in Two Toposequences Developed from Basaltic Rocks in North-Central Region of the Paraná State, Brazil”. Semina: Ciências Agrárias, vol. 34, no. 6, Dec. 2013, pp. 2777-92, doi:10.5433/1679-0359.2013v34n6p2777.