Received 10 June 2019, received in revised form 3 February 2020, accepted 7 June 2020, available online 12 June 2020. Publikacja dostępna w wersji elektronicznej na licencji: CC BY-NC-ND. The project "Regional Excellence Initiative" 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 (K. Sz.-D.).
The project “Green economy as a tool for sustainable development”, founded by West Pomeranian University of Technology, Szczecin (K. Ch., I. B.) |
