Sasimowski, E., and J. Józwik. “The Effect of Glass Fibers on the Resistance to Slow Crack Growth in Polypropylene Molded Pieces”. Polimery, vol. 47, no. 1, Sept. 2022, pp. 54-58, https://polimery.ichp.vot.pl/index.php/p/article/view/1944.