“A Generalization of the Concept of Cointegration to Harmonizable and Class (KF) Processes”, Eur. J. Pure Appl. Math., vol. 3, no. 3, pp. 519–530, May 2010, Accessed: Apr. 29, 2024. [Online]. Available: https://www.ejpam.com/index.php/ejpam/article/view/804