Ferreira, Ester Alice, et al. “Hydrogel Efficiency and Physiological Responses of Seedless Citrus Cultivars Seedlings under Water Deficit”. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], vol. 2, no. 1, June 2014, pp. 158-65, https://doi.org/10.5216/pat.v2i1.25422.