J. Velasco, “The dilemma of the separation of powers in the United States. Presidential versus parliamentary government system : a review of the literature”, PyG, vol. 2, no. 2, pp. 337–356, Apr. 1995, Accessed: Oct. 13, 2026. Available: http://politicaygobierno.cide.edu/index.php/pyg/article/view/567