Ospanova, Zhanar, Kuanyshbek Musabekov, and Saule Aidarova. “Surface Tension and Stability of Foams Based of Keratin Hydrolyzate”. Chemical Bulletin of Kazakh National University 77, no. 1 (March 31, 2015): 88-93. Accessed October 21, 2021. https://bulletin.chemistry.kz/index.php/kaznu/article/view/579.