C. D. L. T. D. ANDRADE, T. A. AMARAL, J. D. O. DUARTE, J. C. GARCIA, D. D. F. SILVA, and P. C. MARTINS, “SIMULATED YIELD AND NET RETURN OF A MAIZE CROP FERTILIZED WITH DIFFERENT SOURCES AND RATES OF NITROGEN”, Int. Jour. M&S, vol. 11, no. 3, pp. 254–267, May 2013.