Clar-Lopez, Miquel, Jordi López-Tamayo, and Raúl Ramos. “Unemployment Forecasts, Time Varying Coefficient Models and the Okun’s Law in Spanish Regions”. Economics and Business Letters 3, no. 4 (December 30, 2014): 247–262. Accessed September 17, 2026. http://156.35.33.188/index.php/EBL/article/view/10417.