Who to blame for groundwater fluoride anomaly in São Paulo, Brazil?: Hydrogeochemistry and isotopic evidence - Martins, Veridiana Teixeira de Souza; Pino, Daphne S; Bertolo, Reginaldo Antonio; Hirata, Ricardo; Babinski, Marly; Pacheco, Diego Felipe; Rios, Ana Paulo (Applied Geochemistry, 2018)