Bedin, A. F., A. V. Kulikov, and A. V. Polbin. “A Markov Switching VECM Model for Russian Real GDP, Real Exchange Rate and Oil Prices”. International Journal of Energy Economics and Policy, vol. 11, no. 2, Feb. 2021, pp. 402-1, https://econjournals.com/index.php/ijeep/article/view/10667.