@book{246729,
	author = {Mafra, M.S.H.},
	title = {Organic carbon contents and stocks in particle size fractions of a typic hapludox fertilized with pig slurry and soluble fertilizer},
	url = {http://www.scielo.br/pdf/rbcs/v39n4/0100-0683-rbcs-39-4-1161.pdf}
}