Song, L., Z. Li, L. Yang, N. Wang, J. Zhao, and Z. Gu. “Preparation and Characterization of Attapulgite Microcapsules Coated With Acrylic Polymer”. Polimery, vol. 66, no. 2, Feb. 2021, pp. 112-8, doi:10.14314/polimery.2021.2.4.