1.
Jankowska B, Matysek-Jędrych A, Mroczek-Dąbrowska K. Efficiency of National Innovation Systems – Poland and Bulgaria in The Context of the Global Innovation Index. CER [Internet]. 2017 Sep. 30 [cited 2025 Dec. 6];20(3):77-94. Available from: https://czasopisma.uni.lodz.pl/CER/article/view/2117