Klapiszewski, Ł., R. Oliwa, M. Oleksy, and T. Jesionowski. “Calcium Lignosulfonate As Eco-Friendly Additive for Crosslinking Fibrous Composites With Phenol-Formaldehyde Resin Matrix”. Polimery, vol. 63, no. 2, Jan. 2021, pp. 102-8, doi:10.14314/polimery.2018.2.3.