Prevedello, C. L., Reichardt, K., Cordeiro, D. G., Melo, E. F. R. Q., & Scheffer, M. (1994). Unit gradient of the hydraulic potential as a source of error in obtaining the hydraulic conductivity of an unsaturated soil. Pesquisa Agropecuaria Brasileira, 29(2), 275–280. https://doi.org/10.1590/S1678-3921.pab1994.v29.4053