Sifouh, N., K. Oubal, and S. Bayoud. “Contribution of the Cointegration Theory to the Study of the Volatility of Financial Markets: Case of the Casablanca Stock Exchange”. European Journal of Marketing and Economics, vol. 5, no. 2, Oct. 2022, pp. 24-34, doi:10.26417/ejme.v1i1.p84-91.