ARTYUH Т., and GRIGORENKO І. “he roblems of afety and uality of ewelry”. "INTERNATIONAL·SCIENTIFIC-·PRACTICAL·JOURNAL·COMMODITIES·AND·MARKETS", vol. 5, no. 1, June 2008, pp. 131-8, https://journals.knute.edu.ua/commodities-and-markets/article/view/1713.