KadirovTulkin Zhumaevich, KhudanovUlugbek Oybutaevich, Ummatova Dilorom. “New Technologies for Skin Impregnation Using Collagen-Polymer Systems”. International Journal of Advanced Science and Technology, Vol. 29, no. 08, June 2020, pp. 3303 -07, http://sersc.org/journals/index.php/IJAST/article/view/25470.