Sousa Júnior, J. R. de, G. S. de Lima, V. L. A. de Lima, H. R. Gheyi, J. R. M. de Sousa, E. M. G. Andrade, and L. A. dos A. Soares. “Growth and Production of Sunflower As a Function of Cationic Nature of the Water and Nitrogen”. Bioscience Journal, vol. 33, no. 3, May 2017, pp. 581-9, doi:10.14393/BJ-v33n3-36534.