Dufour, J., Negro, C., Galvez, J.L. and Lopez-Mateos, F., "Overall recovery of stainless-steel pickling liquors", In: Macias-Machin, A., Umbria, J. (Eds.), Chemical Industry and Environment IV, Universidad de Las Palmas de Gran Canaria, Vol. 1, pp. 219-228, 2003.
 Ferreiraa, A.S. and Mansurb, M.B., "Statistical analysis of the spray roasting operation for the production of high quality Fe2O3 from steel pickling liquors", Process Saf. Environ. Prot. Vol. 89, pp. 172-178. 2011.
 Forsberg, K.M. and Rasmuson, Å.C., "Recycling of waste pickle acid by precipitation of metal fluoride hydrates", Miner. Eng. Vol 20, pp. 950-955. 2007.
 Harscoet, E. and Froelich, D., "Use of LCA to evaluate the environmental benefits of substituting chromic acid anodizing (CAA)", J. Clean. Prod. Vol. 16, pp. 1294-1305. 2008.
 Liu, N.W. and Chou, M.S., "Reduction of secondary aluminum dross by a waste pickling liquor containing ferrous chloride", Sustain, Environ. Res. Vol. 23, No. 1, pp. 61-67. 2003.
 Agrawal, A. and Sahu, K.K., "An overview of the recovery of acid from spent acidic solutions from steel and electroplating industries", J. Hazard. Mater. Vol. 171, pp. 61-75. 2009.
 Regel-Rosacka, M., "A review on method of regeneration of spent pickling solutions from steel processing", J. Hazard. Mater. Vol. 177, pp. 57-69. 2010.
 Sinha, M.K., Sahu, S.K., Meshram, P. and Pandey, B.P., "Solvent extraction and separation of zinc and iron from spent pickle liquor", Hydrometallurgy 147e148, pp. 103-111. 2014.
 Rogener, F., Sartor, M., B_an, A., Buchloh, D. and Reichardt, T., "Metal recovery from spent stainless steel pickling solution", Resour. Conserv. Recycl. Vol.60, pp. 72-77. 2012.
 Tomaszewska, M., Gryta, M., Morawski, A.W., "Study on the concentration of acids by membrane distillation", Journal of Membrane Science, Vol.102, pp. 113-122. 1995.
 Csicsovszki, G., Kekesi, T. and Torok, T.I., "Selective recovery of Zn and Fe from spent pickling solutions by the combination of anion exchange and membrane electrowinning techniques", Hydrometallurgy Vol.77, pp. 19-28, 2005.
 Sengupta, A.K., "Ion Exchange and Solvent Extraction: a Series of Advances", 18. CRC Press, New York. 2007.
 Dahlgren, L., "Treatment of Spent Pickling Acid from Stainless Steel Production: A Review of Regeneration Technologies with Focus on the Neutralization Process for Implementation in Chinese Industry", (Master of science thesis). 2010.