Who does SEO in Spain? A cybermetric methodology for the construction of company universes. Profesional de la información, [S. l.], v. 30, n. 4, 2021. DOI: 10.3145/epi.2021.jul.19. Disponível em: https://revista.profesionaldelainformacion.com/index.php/EPI/article/view/86331. Acesso em: 19 mar. 2026.