Lunardi Neto, Antônio, and Jaime Antonio de Almeida. “Morphological and Chemical Characterization of Ultisols With Darkened Subsurface Horizons in Santa Catarina State”. Revista De Ciências Agroveterinárias, vol. 12, no. 3, May 2013, pp. 294-03, https://revistas.udesc.br/index.php/agroveterinaria/article/view/5225.