GUNARATNE, G P et al. Two new plant nutrient nanocomposites based on urea coated hydroxyapatite: Efficacy and plant uptake. The Indian Journal of Agricultural Sciences, Delhi, India, v. 86, n. 4, p. 494–9, 2016. DOI: 10.56093/ijas.v86i4.57483. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/57483. Acesso em: 25 oct. 2025.