Méndez Delgado, A. V. “Some Determinants of the Innovation Propensity of Mexican Products: The Effect of R&D Expenditures and Knowledge Spillovers”. Estudios Económicos De El Colegio De México, vol. 33, no. 1, Jan. 2018, pp. 29-63, doi:10.24201/ee.v33i1.353.