Spatial variation of chemical attributes in archaeological dark earth under cocoa cultivation in Western Amazon. Bioscience Journal [online], 2019. [online], vol. 35, no. 1, pp. 27–41. [Accessed14 December 2025]. DOI 10.14393/BJ-v35n1a2019-37137. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/37137.