Queiroz, C.G.S. et al. 1993. Diurnal rhythm in nitrate reductase activity of <i>Coffea arabica</i> L. shoots and roots. Pesquisa Agropecuaria Brasileira. 28, 7 (Jul. 1993), 787–795. DOI:https://doi.org/10.1590/S1678-3921.pab1993.v28.3939.