Artykuł jest dostępny również w wersji elektronicznej open access na licencji CC BY 4.0. Received on: 30th of April, 2020, accepted on: 31st of August, 2020, published on: 10th of September, 2020. 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. |
