Vegetation dynamics during the Holocene in a forest-savanna transition, Southern Amazon Basin, based on isotope and phytosociological studies - Vidotto, Elaine; Pessenda, Luiz Carlos Ruiz; Ribeiro, Adauto de Souza; Freitas, Hermes Augusto de; Bendassolli, Jose Albertino (Acta Amazonica, 2007)