SZOPIK-DEPCZYŃSKA, Katarzyna. Effects of innovation activity in industrial enterprises in Eastern Poland. Oeconomia Copernicana, [S. l.], v. 6, n. 2, p. 53–65, 2015. DOI: 10.12775/OeC.2015.012. Disponível em: https://oeconomia.pl/index.php/oc/article/view/173. Acesso em: 8 feb. 2026.