Carbon-13 variation with depth in soils of brazil and climate change during the quaternary - Martinelli, Luiz Antonio; Pessenda, Luiz Carlos Ruiz; Espinoza, E; Camargo, Plinio Barbosa de; Telles, E C C; Cerri, Carlos Clemente; Victoria, Reynaldo Luiz; Aravena, R; Richey, Jeffrey Edward; Trumbone, S (Oecologia, 1996)