Spatial variation of chemical attributes in archaeological dark earth under cocoa cultivation in Western Amazon. Bioscience Journal, Uberlândia, MG, v. 35, n. 1, p. 27–41, 2019. DOI: 10.14393/BJ-v35n1a2019-37137. Disponível em: https://seer.ufu.br/index.php/biosciencejournal/article/view/37137. Acesso em: 10 jan. 2026.