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3. Mercury content of fungi in Helsinki;Laaksovirta;Ann. Bot. Fenn.,1979
4. Les teneurs es selenium de 95 especes de champignon superieurs et de quelques terres;Quinche;Rech. Agron. en Suisse,1983
5. Cadmium in mushrooms, distribution growth effects and binding;Schmitt;Trace Elements in Medicine,1985