Engelhardt, M.M. et al. 2020. Copper phytotoxicity in agricultural crops cultivated in tropical soils. Semina: Ciências Agrárias. 41, 6Supl2 (Nov. 2020), 2883–2898. DOI:https://doi.org/10.5433/1679-0359.2020v41n6Supl2p2883.