Pillar, V. D. P., Jacques, A. V. A., & Boldrini, I. I. (1992). Environmental factors related to the vegetational variation of a natural grassland. Pesquisa Agropecuaria Brasileira, 27(8), 1089–1101. https://doi.org/10.1590/S1678-3921.pab1992.v27.3746