Gallego, Francisco, and Christian Johnson. “Theoretical and Practical Approaches for Determining Trend Output: An Application to Chile”. ECONOMÍA CHILENA 4, no. 2 (August 26, 2001): 27–58. Accessed April 18, 2026. http://xn--economachilena-5lb.cl/index.php/economiachilena/article/view/41.