Bajer, K., R. Malinowski, D. Bajer, and S. Richert. 2010. “Properties of poly(lactic Acid) Ecoflex Rigid Foil Sheets Applied in Thermof Orming Process”. Polimery 55 (7-8):591-93. https://ichp.vot.pl/index.php/p/article/view/1045.