“Formation of Effective Investment Portfolios on the Financial Markets: Estimation and Management Models”, Mediterr. J. Soc. Sci., vol. 6, no. 2 S4, p. 21, Apr. 2015, Accessed: Dec. 25, 2024. [Online]. Available: https://www.richtmann.org/journal/index.php/mjss/article/view/6133