ZYGMUNT, A. External linkages and intellectual assets as indicators of firms? innovation activities: results from the Czech Republic and Poland. Oeconomia Copernicana, [S. l.], v. 10, n. 2, p. 291–308, 2019. DOI: 10.24136/oc.2019.015. Disponível em: http://economic-research.pl/Journals/index.php/oc/article/view/1572. Acesso em: 27 jan. 2022.