Lipiec, I. and Rusiniak, P. 2020. Stability assessment of sulphur (II) compounds in medicinal water from B-8b Michał intake in Busko-Zdrój. Bulletin of Geography. Physical Geography Series. 18 (Jun. 2020), 17–23. DOI:https://doi.org/10.2478/bgeo-2020-0002.