De Sanfilippo, C., E. Arguello, J. A. Correa, y G. A. Orioli. «The Effect of Humic Acids on Root Growth and Endogenous Levels of Auxin and Inhibitory-Like Substances». AgriScientia, vol. 7, n.º 1, pp. 9-12, doi:10.31047/1668.298x.v7.n1.936.