О.О. Zakharkin, L.L. Hrytsenko, L.S. Zakharkina, и Iu.O. Myroshnychenko. «COMPARATIVE ANALYSIS OF RETURN AND VOLATILITY OF THE KAZAKH AND UKRAINIAN STOCK MARKET SUBJECT TO THE INVESTMENT TIME HORIZON1». 2021. Научный журнал «Вестник НАН РК», вып. 3, октябрь 2021 г., сс. 133-8, https://journals.nauka-nanrk.kz/bulletin-science/article/view/2099.