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SENILA, M. .; KOTSEV, T. .; LEVEI, E. A. .; ROMAN, M. .; MLADENOV, V. .; CHOLAKOVA, Z. .; SENILA, L. . PRELIMINARY INVESTIGATION ON ARSENIC FRACTIONATION IN SOIL FROM OGOSTA RIVER FLOODPLAIN USING A SEVEN-STEP EXTRACTION PROCEDURE. Studia UBB Chemia 2016, 61, 333-344.