Martín Montaner, J., F. Requena, and G. Serrano. “International Trade and Migrant Networks: Is It Really about Qualifications?”. Estudios De Economía, vol. 41, no. 2, Sept. 2015, pp. pp. 251-260, https://estudiosdeeconomia.uchile.cl/index.php/EDE/article/view/37253.