ANALYSIS OF SPONTANEOUS VEGETATION IN SEMI-ARID CATTLE FIELDS OF THE MIDDLE VALLEY OF RÍO NEGRO. SciELO Preprints, 2020. DOI: 10.1590/SciELOPreprints.1455. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/1455. Acesso em: 18 maio. 2026.