Kompa, Krzysztof, and Dorota Witkowska. “COMPARISON OF THE OPEN INVESTMENT FUNDS EFFICIENCY AT BULL AND BEAR MARKETS”. Acta Scientiarum Polonorum. Oeconomia 9, no. 3 (September 30, 2010): 169–180. Accessed April 13, 2024. https://aspe.sggw.edu.pl/article/view/700.