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Biocybernetics and Biomedical Engineering > 2021 > Vol. 41, no. 4 > 1589--1600
Comparative Economic Research. Central and Eastern Europe > 2016 > 19 > 3 > 69-92
Zeszyty Naukowe ZPSB Firma i Rynek > 2016 > 1(49) > 23-32
Acta Innovations > 2015 > no. 17 > 56--64