Silva, João dos Santos Vila da, and Myrian de Moura Abdon. “Delimitation of the Brazilian Pantanal and Its Subregions”. Pesquisa Agropecuaria Brasileira, vol. 33, no. 13, Dec. 1998, pp. 1703-11, doi:10.1590/S1678-3921.pab1998.v33.5050.