1. Rare Earths enter the dragon;O'Driscoil;Industrial Minerals,1988
2. Separation Factors Between Adjacent Rare Earths Extracted from a Mixed Rare Earth Chloride Solution using “Ionquest 801”;Balint,1991
3. Modelling and Simulation of an Extractor for Separation of Rare Earth Systems;Silva,1991
4. Calculation of Counter-Current Extraction of Lanthanides with a Digital Computer;Goto;ISEC 1011,1971