Uhdre, R. S., A. R. Manningel, A. E. A. Ecker, M. Sorace, J. H. Castaldo, e A. Nolla. 2017. “Cultivation of Helianthus Annuus L. Cv. Sunflower Sunspot Dwarf With Silicon Application”. Scientific Electronic Archives 10 (2):64-67. https://doi.org/10.36560/1022017435.