V. A. Snyder, A. González-Vélez, A. J. Beale, and M. A. Vázquez, “Raised beds and aeration tubing for growing tanier (Xanthosomaspp.) in a poorly drained upland Ultisol with a perched water table”, JAUPR, vol. 94, no. 3-4, pp. 225–235, Oct. 2010.