SOCHA, Robert; WDOWIŃSKI, Piotr. Crude Oil Price and Speculative Activity A Cointegration Analysis. Central European Journal of Economic Modelling and Econometrics, [S. l.], v. 10, n. 3, p. 263–304, 2018. DOI: 10.24425/cejeme.2018.125282. Disponível em: https://wydawnictwo.pan.pl/index.php/cejeme/article/view/136. Acesso em: 27 feb. 2026.