Valuable elements in sludge from eight municipal wastewater treatment plants in relation to their recovery potential by Dobril Valchev, Irina Ribarova, Boyan Borisov, Viden Radovanov, Valentina Lyubomirova, Irina Kostova, Galina Dimova, Orhideya Karpuzova, Svetlana Lazarova

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