Sanzonowicz, Claudio, and Thomas Jot Smyth. “Effect of Hydrogen on Soybean Root Growth in a Subsurface Solution”. Pesquisa Agropecuaria Brasileira, vol. 30, no. 2, Feb. 1995, pp. 255-61, doi:10.1590/S1678-3921.pab1995.v30.4300.