de Juan, D., V. Meseguer, and L. J. Lozano. “Chromiun Extraction With Organic Solvents. Part 3. Application to the Treatment of Polymetallic Industrial Residues”. Revista De Metalurgia, vol. 34, no. 5, Oct. 1998, pp. 391-8, doi:10.3989/revmetalm.1998.v34.i5.806.