Beliaev, A.Yu. “INVESTIGATION OF POLYURETHANE, USED FOR THE PRODUCTION OF BIO-IMPLANTS, WITH THE HELP OF MODERN EXPERIMENTAL METHODS TO IMPROVE THE PERFORMANCE OF BIO-IMPLANTS”. Perm Federal Research Centre Journal, no. 4, Dec. 2016, pp. 5-10, https://journal-dev.icmm.ru/index.php/pscj/article/view/PSCJ2016n4p1.