%0 Journal Article %T OPTIMIZATION OF AN INVESTMENT PORTFOLIO BASED ON THE RISK CRITERION USING THE MARKOWITZ MODEL %A Igonina, T.R. %A Keselman, V.M. %A Sazonov, A.I. %A Borec, A.S. %K Markowitz model, investment portfolio, optimization, risk, return, diversification, covariance, financial mathematics %J MOSCOW ECONOMIC JOURNAL %D 2026 %N 11 %P 22 %I Electronic science