Karpio, A., and D. Żebrowska-Suchodolska. “STABILITY OF STRATEGIES OF POLISH OPEN-END INVESTMENT FUNDS INVESTING IN GLOBAL MARKETS DURING THE FINANCIAL CRISIS”. Acta Scientiarum Polonorum. Oeconomia, Vol. 10, no. 3, Sept. 2011, pp. 51-59, https://js.wne.sggw.pl/index.php/aspe/article/view/4021.