C. Hickmann, Álvaro V. de Resende, C. A. Silva, J. J. de J. Lacerda, A. E. Furtini Neto, e S. G. Moreira, “Soybean response to NPK fertilization of sowing and potassium at topdressing in soil of improved fertility”, R. Agrogeoambiental, vol. 9, nº 2, jul. 2017.