Potrykus M. ASSESSMENT OF GOLD AND/OR CRUDE OIL AS INVESTMENTS FOR PORTFOLIO DIVERSIFICATION. A WARSAW STOCK EXCHANGE CASE STUDY. aspe [Internet]. 2019Dec.30 [cited 2024Apr.30];18(4):77-4. Available from: https://js.wne.sggw.pl/index.php/aspe/article/view/1969