de Juan, D., Meseguer, V., & Lozano, L. J. (1998). Chromium extraction with organic solvents. Part 2. Extraction with TBP and with Primene 81R. Revista De Metalurgia, 34(4), 319–327. https://doi.org/10.3989/revmetalm.1998.v34.i4.798