HALKO С., MYKHAILOVA Г., and OSIEVSKA В. “arket of edding: gment of illows”. NTERNATIONAL CIENTIFIC-RACTICAL OURNAL OMMODITIES ND ARKETS, vol. 25, no. 1, Mar. 2018, pp. 89-100, https://journals.knute.edu.ua/commodities-and-markets/article/view/949.