Nitrate Contamination in Brazilian Urban Aquifers: a Tenacious Problem - Hirata, Ricardo; Cagnon, Fabiana; Bernice, Aline; Maldaner, Carlos Henrique; Galvão, Paulo; Marques, Carlos; Terada, Rafael; Varnier, Claudia; Ryan, M. Cathryn; Bertolo, Reginaldo Antonio (Water, 2020)