Słodownik, P. and Opaliński, K.W. 2020. Oxygen consumption in the sandy beaches of the Vistula River: Goods and services of the ecosystem. Studia Ecologiae et Bioethicae. 18, 5 (Dec. 2020), 369–377. DOI:https://doi.org/10.21697/seb.2020.18.5.34.