Węgrzyn, R. 2015. 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. 2(938) (Nov. 2015), 111–128. DOI:https://doi.org/10.15678/ZNUEK.2015.0938.0209.