Lunardi Neto, Antônio, and Jaime Antonio de Almeida. “Mineralogy of the Silt and Clay Fractions in Ultisols With Darkened Subsurface Horizon in the State of Santa Catarina”. Revista De Ciências Agroveterinárias, vol. 12, no. 3, May 2013, pp. 282-93, https://periodicos.udesc.br/index.php/agroveterinaria/article/view/5224.