(1)
Gava, G. J. de C.; Oliveira, M. W. de; Silva, M. de A.; Jerônimo, E. M.; Cruz, J. C. S.; Trivelin, P. C. O. Phytomass Production and Nitrogen Accumulation in Maize Cultivated With Different Doses of 15N-Urea. Semina: Ciênc. Agrár. 2010, 31, 851-862.