C. Lawson and A. Moreno, “Mexico 2006 Panel Study: Measuring Changes in Electoral Preferences During the Presidential Campaign”, PyG, vol. 14, no. 2, pp. 437–461, Apr. 2007, Accessed: Oct. 13, 2026. Available: http://politicaygobierno.cide.edu/index.php/pyg/article/view/246