WĘGRZYN, Ryszard. Changes in the Strength of Connections and the Volatility of Indices of the World Stock Exchanges. Krakow Review of Economics and Management/Zeszyty Naukowe Uniwersytetu Ekonomicznego w Krakowie, Krakow, n. 2(938), p. 111–128, 2015. DOI: 10.15678/ZNUEK.2015.0938.0209. Disponível em: https://aoc.uek.krakow.pl/index.php/krem/article/view/479.. Acesso em: 20 sep. 2024.