Silva, Adilson Luz da, et al. “Microbial Carbon and Nitrogen in Onion Cropping Systems in Humic Cambisol”. Revista De Ciências Agroveterinárias, vol. 13, no. 2, Nov. 2014, pp. 142-50, https://periodicos.udesc.br/index.php/agroveterinaria/article/view/5627.