HEIMLER, A.; MALERBA, F.; PERETTO, P. Sources, appropriability, and directions of technological change: the cases of the United States and Italy. PSL Quarterly Review, [S. l.], v. 46, n. 185, 2013. DOI: 10.13133/2037-3643/10687. Disponível em: https://rosa.uniroma1.it/rosa04/psl_quarterly_review/article/view/10687. Acesso em: 16 may. 2024.