Siqueira, José Oswaldo, and Geraldo A. A. Guedes. “Effect of Thermal Treatment on the Agronomic Efficiency of Nepheline Sienite”. Pesquisa Agropecuaria Brasileira 21, no. 5 (April 17, 2014): 481–488. Accessed November 12, 2025. https://apct.sede.embrapa.br/pab/article/view/14803.