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2. Heavy metal contamination in the sea;Bryan,1976
3. Impact of tannery wastes to the benthic communities in Geras Gulf (Lesvos isl., Greece);Catsiki,1986
4. Bioaccumulation of heavy metal ions by seagrasses in Greek coastal waters;Catsiki;Posid. Newsletter,1987
5. Metal pollution;Förstner,1979