Oliveira, Hend Pereira de, et al. “Performance of Pre-Sprouted Sugarcane Seedlings in Response to the Application of Humic Acid and Plant Growth-Promoting Bacteria”. Semina: Ciências Agrárias, vol. 39, no. 3, May 2018, pp. 1365-70, doi:10.5433/1679-0359.2018v39n3p1365.