Santana, José Augusto da Silva, et al. “Structure and Spatial Distribution Patterns of Caatinga Vegetation in Seridó Ecological Station, RN, Brazil”. Pesquisa Florestal Brasileira, vol. 36, no. 88, Dec. 2016, pp. 355-61, https://doi.org/10.4336/2016.pfb.36.88.1002.