AbdelFattahN.A, SadeekA.S,AliB.H,Abdo,A.A,Weheish,H.L.a 2015. Spectrophotometric Determination of Praseodymium by 1,4- Dihydroxyanthraquinone after its Selective Separation from Rosetta Monazite Rare Earth Concentrate by Solvent Extraction. Arab Journal for Sciences and Research Publishing. 1, 2 (Sep. 2015), 25–12. DOI:https://doi.org/10.26389/AJSRP.A27416.