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\bibitem{Horoszewicz+Backiel2003} Horoszewicz, L., \& Backiel, T. (2003). GROWTH OF WELS (SILURUS GLANIS L.) IN THE VISTULA RIVER AND THE ZEGRZY{\~N}SKI RESERVOIR. \textit{Archives of Polish Fisheries}, \textit{11}(1), 115--121.

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