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Species composition and diatom indices in relation to environmental parameters in Estonian streamsVilbaste, Sirje; Truu, Jaak; Leisk, Ülle; Iital, ArvoArchiv für hydrobiologie : supplement2007 / 3/4, p. 307-326 : ill https://www.schweizerbart.de/papers/largerivers/detail/17/80030/Species_composition_and_diatom_indices_in_relation_to_environmental_parameters_in_Estonian_streams