JANKOWSKA, Barbara; MATYSEK-JĘDRYCH, Anna; MROCZEK-DĄBROWSKA, Katarzyna. Efficiency of National Innovation Systems – Poland and Bulgaria in The Context of the Global Innovation Index. Comparative Economic Research. Central and Eastern Europe, [S. l.], v. 20, n. 3, p. 77–94, 2017. DOI: 10.1515/cer-2017-0021. Disponível em: https://czasopisma.uni.lodz.pl/CER/article/view/2117. Acesso em: 6 dec. 2025.