da Mota, Fernando Silveira. “Drought Risks for the Soybean Crop in Rio Grande Do Sul State, Brazil”. Pesquisa Agropecuaria Brasileira 27, no. 5 (May 1, 1992): 709–720. Accessed March 25, 2026. https://apct.sede.embrapa.br/pab/article/view/3702.