Perifanis, Theodosios, and Athanasios Dagoumas. “Price and Volatility Spillovers Between Crude Oil and Natural Gas Markets in Europe and Japan-Korea”. International Journal of Energy Economics and Policy 10, no. 5 (August 10, 2020): 432–446. Accessed April 26, 2024. https://www.econjournals.com/index.php/ijeep/article/view/9774.