Gorczyca, G., and R. Tylingo. “Biopolymers in Designing Modern Antimicrobial Medical Materials. Part 1, Biopolymer Medical Materials — Collagen, Chitosan”. Polimery, vol. 56, no. 10, Oct. 2011, pp. 709-15, https://ichp.vot.pl/index.php/p/article/view/960.