Begum, F., Haleem Khan, M., Aslam Mirza, M., Aziz Choudhary, M., & J. Baker, R. (2015). Synergic Extraction of Europium(III) with 1 M Mixture of Di-n-butylsulfoxide and Bis(2,4,4-Trimethylpentyl)phosphinic Acid in Chloroform and its Subsequent Determination by Using Arsenazo(III) as Chromogenic Reagent. Asian Journal of Chemistry, 27(10), 3609–3615. https://doi.org/10.14233/ajchem.2015.18887