Publikacja w wersji elektronicznej dostępna w formule open access na licencji Creative Commons Attribution 4.0 International License (CC-BY 4.0). Received 10 January 2020, accepted 17 July 2020, first published online 1 October 2020, published in issue 17 November 2020. Journal uses continuous publication model. Vol 26 No 6 (2020) in progress [2020.11.24]. The project is financed within the framework of the program of the Minister of Science and Higher Education under the name “Regional Excellence Initiative” in the years 2019–2022. |
