B.T. Yermagambet, M.K. Kazankapova, A.T. Nauryzbayeva, и Zh.M. Kassenova. «SYNTHESIS OF CARBON NANOFIBERS BASED ON HUMIC ACID AND POLYACRYONITRILE BY ELECTROSPINNING METHOD». Academic Scientific Journal of Chemistry, вып. 3, июнь 2021 г., сс. 104-10, https://journals.nauka-nanrk.kz/chemistry-technology/article/view/2140.