Perrotini-Hernàndez, I., and J. A. Vàzquez-Munoz. “Endogenous Growth and Economic Capacity: Theory and Empirical Evidence for the NAFTA Countries”. PSL Quarterly Review, vol. 70, no. 282, Sept. 2017, pp. 247-82, doi:10.13133/2037-3643_70.282_2.