Bieniek, A., et al. “Influence of the Structures of Polyamide 6 Fibers on Their Ageing under Intensive Insolation Conditions”. Polimery, vol. 54, no. 11-12, Aug. 2022, pp. 840-4, https://polimery.ichp.vot.pl/index.php/p/article/view/1266.