Reconnaissance of submarine groundwater discharge at Ubatuba coast, Brazil, using ²²²Rn as a natural tracer - Oliveira, J; Burnett, W. C; Christoff, J; Furtado, Valdenir Veronese; Mazzilli, Barbara Paci; Braga, Elisabete de Santis; Farias, L. A (Journal of Environmental Radioactivity, 2003)