Uwagi: |
Publikacja dostępna w wersji elektronicznej w formule open access. Submitted 11/09/20, 1st revision 05/10/20,2nd revision 13/10/20, accepted 13/11/20, published 24/11/20. Paper presented in: International Conference on Applied Business and Economics (ICABE 2020), October 7-9, 2020, Szczecin, Poland, a digital conference. |