VALENCIA, Sofia. Market structure and innovation de Morton I. Kamien y Nancy L. Schwartz. Economia, [S. l.], v. 13, n. 25, p. 166–170, 1990. DOI: 10.18800/economia.199001.007. Disponível em: https://revistas.pucp.edu.pe/index.php/economia/article/view/702. Acesso em: 28 dec. 2025.