Assessing pollution in the Kola River, northwestern Russia, using metal concentrations in water and bryophytes. - Pekka, Lariska; Halmeenpää, Hanna; Ecke, Frauke; Vuori, Kari-Matti; Mokrotovarova, Olga; Öhlander, Björn; Ingri, Johan (Boreal Environment Research, 2008)