Słodownik, P., and K. W. Opaliński. “Oxygen Consumption in the Sandy Beaches of the Vistula River: Goods and Services of the Ecosystem”. Studia Ecologiae Et Bioethicae, vol. 18, no. 5, Dec. 2020, pp. 369-77, doi:10.21697/seb.2020.18.5.34.