Han, J., X. Cai, G. Sun, and Y. Cui. “Effect of Structure on Extraction Behavior of Praseodymium With a Series of Unsymmetrical Diglycolamides from Hydrochloric Acid”. Journal of the Serbian Chemical Society, vol. 83, no. 9, Sept. 2018, pp. 969–980, doi:10.2298/JSC171109043H.