Mendes, L.T. et al. 2006. Physical-chemical and bacteriological aspects of the groundwater in the sanitary landfills in the metropolitan region of Londrina, Paraná, Brazil. Semina: Ciências Exatas e Tecnológicas. 27, 2 (Dec. 2006), 139–146. DOI:https://doi.org/10.5433/1679-0375.2006v27n2p139.