Comparison of dissolution methods for multi-element analysis of some plant materials used as bioindicator of sulphur and heavy metal deposition determined R. Pöykiö, H. Torvela, P. Perämäki, T. Kuokkanen and H. RönkkömäkiAnalusis, 28 9 (2000) 850-854DOI: https://doi.org/10.1051/analusis:2000155