Marhabaeva, A., Z. Kalkozova, Y. Mandybayev, A. Azatkaliev, and K. Abdullin. “Preparation Method of Tungsten Oxide and Metallic Tungsten Nano-Powders Using Degreased Cotton”. Physical Sciences and Technology, vol. 4, no. 2, July 2018, pp. 48-53, doi:10.26577/phst-2017-2-133.