Brotheridge, R. M. ym.: Nickel, cobalt, zinc and copper levels in brown trout (Salmo trutta) from the river Otra, southern Norway. Analyst, 1998, s. 69-72. PubMed:9581023doi:10.1039/a704883aArtikkelin verkkoversio. (pdf) Viitattu 4.10.2023.
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Brotheridge, R. M. ym.: Nickel, cobalt, zinc and copper levels in brown trout (Salmo trutta) from the river Otra, southern Norway. Analyst, 1998, s. 69-72. PubMed:9581023doi:10.1039/a704883aArtikkelin verkkoversio. (pdf) Viitattu 4.10.2023.
Brotheridge, R. M. ym.: Nickel, cobalt, zinc and copper levels in brown trout (Salmo trutta) from the river Otra, southern Norway. Analyst, 1998, s. 69-72. PubMed:9581023doi:10.1039/a704883aArtikkelin verkkoversio. (pdf) Viitattu 4.10.2023.