Grabowska, Beata, et al. “Polylactide Used As Filment in 3D Printing – Part 1: FTIR, DRIFT and TG-DTG Studies”. Journal of Casting & Materials Engineering, vol. 4, no. 3, Sept. 2020, pp. 48-52, https://doi.org/10.7494/jcme.2020.4.3.48.