D. J. Robbins, “Technological Change, Human Capital Accumulation, Wage Structure and the Growth of Real Wages”, Cuad Adm., vol. 16, no. 25, Jun. 2003, Accessed: Jul. 26, 2025. [Online]. Available: https://revistas.javeriana.edu.co/index.php/cuadernos_admon/article/view/5450