Heinrichs, R. et al. 2012. Doses and sources of nitrogen fertilizer and their effects on soil chemical properties and forage yield of Brachiaria brizantha cv. Xaraés. Semina: Ciências Agrárias. 33, 5 (out. 2012), 1745–1754. DOI:https://doi.org/10.5433/1679-0359.2012v33n5p1745.