Tóth, Annamária, and Katalin Halász. “Properties of Cellulose Sheets Modified With Potassium-Humate and Copper (II)-Sulfate”. International Journal of Engineering and Management Sciences, vol. 4, no. 1, Mar. 2019, pp. 276-85, https://doi.org/10.21791/IJEMS.2019.1.35.