Nikje, M. M. “Polyurethane Foams Produced from Components Received in Microwave Assisted Recycling of PUR Waste and Starch Liquefaction”. Polimery, vol. 57, no. 1, Jan. 2012, pp. 11-17, https://polimery.ichp.vot.pl/index.php/p/article/view/802.