Application of Crustaceans as Ecological Markers for the Assessment of Pollution of Brackish Lakes of Bulgaria Based on Their Ability to Accumulate the Heavy Metals Cd, Zn and Ni od Elica Valkova, Vasil Atanasov, Margarita H. Marinova, Antoaneta Yordanova, Kristian Yakimov, Yordan Kutsarov

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