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Adam Sadowski
University of Lodz, Faculty of Management Poland
Michał Sadowski
Jagiellonian University, Faculty of Mathematics and Computer Science Poland
Per Engelseth
Tromso UniversityTromsø School of Business and Economics, UiT The Arctic University of Norway, Norway
Zbigniew Galar
Bayer, Al. Jerozolimskie 158 02-326 WarszawaPoland
Beata Skowron-Grabowska
Czestochowa University of Technology, Faculty of Management Czestochowa, Poland