KOLTUNOV В., and BELINSKA Є. “ubstantiation of adish eeping fficiency by Harrington’s ethod”. NTERNATIONAL CIENTIFIC-RACTICAL OURNAL OMMODITIES ND ARKETS, vol. 10, no. 2, Jan. 2011, pp. 62-68, https://journals.knute.edu.ua/commodities-and-markets/article/view/1578.