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Šárka Čemerková
Silesian University in Opava, School of Business Administration in Karviná, Department of Business Economics and Management, Univerzitní náměstí 1934/3,Karviná, Czech Republic
Jarmila Šebestová
Silesian University in Opava, School of Business Administration in Karviná, Department of Business Economics and Management, Univerzitní náměstí 1934/3,Karviná, Czech Republic
Roman Šperka
Silesian University in Opava, School of Business Administration in Karviná, Department of Business Economics and Management, Univerzitní náměstí 1934/3,Karviná, Czech Republic