Tfouni, E., Pavanin, L.A. and Serra, O.A. 1984. Use of sequential columns in ion exchange rare earth separations. Eclética Química. 9, 1 (Dec. 1984), 51–55. DOI:https://doi.org/10.26850/1678-4618eqj.v9.1.1985.p51-55.