Zuquim, Gabriela, Flávia Regina Capellotto Costa, and Jefferson Prado. 2007. “Sample Effort Reduction Vs. Information Retention in Inventories of Pteridophytes in Central Amazonia”. Biota Neotropica 7 (3). Sao Paulo, Brazil. //www.biotaneotropica.org.br/BN/article/view/351.