“ANALYSIS OF INTERDEPENDENCE OF ECONOMIC CYCLES IN THE SOUTHWESTERN REGION OF COLOMBIA: AN ECONOMETRIC APPROACH USING KALMAN AND HODRICK-PRESCOTT FILTERS (Article published in Spanish)”, estud.gerenc., vol. 27, no. 121, pp. 115–142, Dec. 2011, doi: 10.1016/S0123-5923(11)70184-X.