Méndez DelgadoAlba. “Some Determinants of the Innovation Propensity of Mexican Products: The Effect of R&D Expenditures and Knowledge Spillovers”. Estudios Económicos 33, no. 1 (January 1, 2018): 29-63. Accessed August 13, 2020. https://estudioseconomicos.colmex.mx/index.php/economicos/article/view/353.