'PB'-'PB', 'RB'-'SR' and k-'AR' systematics of the Lagoa Real uranium province (south-central Bahia, Brazil) - Cordani, Umberto G.; Iyer, Sundaram Sankara Subba; Taylor, Paul Nigel; Kawashita, Koji; Sato, Kei; McReath, Ian (Journal of South American Earth Sciences, 1992)