1.
Neptune A, Tabatabai M, Hanway J. Sulfur fractions and carbon-nitrogen-phosphorus-sulfur relationships in some Brazilian and Iowa soils . An. Esc. Super. Agr. Luiz de Queiroz [Internet]. 1jan.1974 [citado 23nov.2019];31:605-19. Available from: http://www.revistas.usp.br/aesalq/article/view/39066