T. Muraoka and A. Neptune, “ Effect of day time on foliar spraying of several levels of nitrogen fertilizer, NPKS solutions and its components, on common bean leaves ”, An. Esc. Super. Agr. Luiz de Queiroz, vol. 34, pp. 493–495, Jan. 1977, doi: 10.1590/S0071-12761977000100039.