USCKA-KOWALKOWSKA, Joanna, POSYNIAK, Michał, MARKOWICZ, Krzysztof M. and PODGÓRSKI, Jerzy. Comparison of the Linke turbidity factor in Warsaw and in Belsk. Bulletin of Geography. Physical Geography Series. Online. 21 December 2017. No. 13, pp. 71-81. [Accessed 19 July 2024]. DOI 10.1515/bgeo-2017-0015.