Begum, Farzana, M. Haleem Khan, M. Aslam Mirza, Muhammad Aziz Choudhary, and Robert J. Baker. 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):3609-15. https://doi.org/10.14233/ajchem.2015.18887.