Lunardi Neto, Antônio, and Jaime Antonio de Almeida. 2013. “Morphological and Chemical Characterization of Ultisols With Darkened Subsurface Horizons in Santa Catarina State”. Revista De Ciências Agroveterinárias 12 (3). Lages:294-303. https://periodicos.udesc.br/index.php/agroveterinaria/article/view/5225.