SENILA, Marin, et al. “PRELIMINARY INVESTIGATION ON ARSENIC FRACTIONATION IN SOIL FROM OGOSTA RIVER FLOODPLAIN USING A SEVEN-STEP EXTRACTION PROCEDURE”. Studia Universitatis Babeș-Bolyai Chemia, vol. 61, no. 3, Sept. 2016, pp. 333-44, https://studia.reviste.ubbcluj.ro/index.php/chemia/article/view/8355.