Nazhipkyzy, M., A. Nurgain, A. Zhaparova, A. Seitkazinova, N. Prikhodko, and R. Nemkayeva. “Raman Characteristics of Multiwalled Carbon Nanotubes Based on Diatomite”. Eurasian Chemico-Technological Journal, Vol. 20, no. 4, Dec. 2018, pp. 319-23, doi:10.18321/ectj765.