Lopes, A. and Piedade, M. T. F. (2010) “The period of contamination with petroleum influences the regrowth of Echinochloa polystachya (HBK) Hitchcock in varzea soil in Central Amazon?”, Biota Neotropica. Sao Paulo, Brazil, 10(4). Available at: https://www.biotaneotropica.org.br/BN/article/view/729 (Accessed: 22 January 2026).