R.R. Moskalyk, Gallium: the backbone of the electronics industry, Minerals Engineering, 16 (2003) 921-929.
 O. Font, X. Querol, R. Juan, R. Casado, Recovery of gallium and vanadium from gasifi cation fl y ash, Journal of hazardous materials, 139 (2007) 413-423.
 I.M. Ahmed, Y.A El-Nadi, N.E. El-hefny, Extraction of gallium from hydrochloric acid by cyanex 923 and cyanex 925, Hydrometallurgy, 131 (2013) 24-28.
 D.O. Flamini, S.B. Saidman, J.B. Bessone, Electrodeposition of gallium onto vitreous carbon, Journal of Applied Electrochemistry, 37 (2007) 467-471.
 K. Xu, T. Deng, J. Liu, W. Peng, Study on the recovery of gallium from phosphorus fl ue dust by leaching with spent sulfuric acid solution and precipitation, Hydrometallurgy, 86 (2007) 172-177.
 Z. Fang, H.D. Gesser, Recovery of gallium from coal fl y ash, Hydrometallurgy, 41 (1996) 187-200.
 J.A. Sturgill, J.T. Swartzbaugh, P.M. Randall, Pollution prevention in the semiconductor industry through recovery and recycling of gallium and arsenic from GaAs polishing wastes, Clean Technologies and Environmental Policy, 2 (2000) 18-27.
 H.S. Lee, C.W. Nam, A study on the extraction of gallium from gallium arsenide scrap, Hydrometallurgy, 49 (1998) 125-133
 L. Stoica, M. Dinculescu, and C.G. Plapcianu, Mn(II) recovery from aqueous systems by fl otation, Water Res, 32 (1998) 3021-3030.
 L.K. Wang, Y.T. Hung, Adsorptive bubble separation and dispersed air fl otation, In Advanced Physicochemical Treatment Processes, (2006) 81-122.
 L.O. Filippov, III /Zeolites: ion exchangers, ion fl otation, Laboratoire Environnement et Mine and ralurgie, (2000) 3179-3186.
 R. B. Grieves, Foam separations: a review, The Chemical Engineering Journal, 9 (1975) 93-106.
 R. Lemlich, Adsorptive bubble separation techniques, Elsevier, (1972). doi:10.1016/B978-0-12-443350-2.50005-8.
 M. Reyes, M. Patiño, F. Tavera, F. Escudero, R. Rivera, I. Pérez, Kinetics and recovery of xanthate-copper compounds by ion fl otation techniques, Journal of the Mexican Chemical Society, 1 (2009) 15–22
 M. Reyes, F. Patiño, R. Escudero, M. Pérez, M.U. Flores, I.A. Reyes, kinetics and hydrodynamics of silver ion fl otation, Journal of the Mexican Chemical Society, 56 (4) (2012) 408–416.
 T. Kinoshita, Y. Ishigaki, N. Shibata, S. Akita, H. Kondou, S. Nii, Selective recovery of gold(III) via continuous counter-current foam separation from hydrochloric acid solution – Effects of foam and column sizes on separation performance, Separation and Purifi cation Technology, 116 (2013) 335–341.
 I.B. Scorzelli, A.L. Fragomeni, M.L. Torem, Removal of cadmium from a liquid effl uent by ion fl otation, Minerals Engineering, 12 (8) (1999) 905–917.
 A.I. Zouboulis, K.A. Matis, Ion fl otation in environmental technology, Chemosphere. 16 (1987) 623–631.
 Z. Bahri, B. Rezai, and E. Kowsari, Selective separation of gallium from zinc using fl otation: effect of solution pH value and the separation mechanism, Minerals Engineering, 86 (2016) 104-113.
 M.H Ehrampoush, M.H. Salmani, M.T. Ghaneian, M. Davoudi, M.H. Fallahzadeh, Selectivity in removal of cadmium(II) from mixed metal effl uents using ion fl otation, World Applied Science Journal, 13(1) (2011) 52-59.
 C. Micheau, A. Schneider, L. Girard, P. Bauduin, Evaluation of ion separation coeffi cients by foam fl otation using a carboxylate surfactant, Colloids and Surfaces A: Physicochemical and Engineering Aspects 470 (2015) 52–59.
 Z. Bahri, B. Rezai, E. Kowsari, Evaluation of cupferron on the selective separation of gallium from aluminum by fl otation: The separation mechanism, Minerals Engineering, 98 (2016) 194-203.
 R. Lemlich, J. Arod, Adsorptive bubble separation techniques, Academic Press, (1972)
 W. Walkowiak, Mechanism of selective ion fl otation. 1. selective fl otation of transition metal cations, Separation Science and Technology, 26 (1991) 559–568.
 A.J.M. Valente, H.D. Burrows, , S.M.A. Cruz, R.F.P. Pereira, A.C.F. Ribeiro, V.M.M. Lobo, Aggregation and micellization of sodium dodecyl sulfate in the presence of Ce(III) at different temperatures: A conductometric study, Journal of Colloid and Interface Science 323 (2008) 141-145.
 R. Sadeghi, R. Golabiazar, Study of salt effects on the aggregation behavior of ionic liquid 1-dodecyl-3-methylimidazolium bromide in aqueous solution, Journal of Molecular Liquids, 197 (2014) 176-183.
 A.J.M. Valente, H.D. Burrows, R.F. Pereira, A.C.F. Ribeiro, J.L.G. Costa Pereira, V.M.M. Lobo, Effect of Europium(III) Chloride on the Aggregation Behavior of Sodium Dodecyl Sulfate, Langmuir, 22 (2006) 5625-5629.
 R.F.P. Pereira, M.J. Tapia, A.J.M. Valente, H.D. Burrows, Effect of metal ion hydration on the interaction between sodium carboxylates and aluminum(III) or chromium(III) ions in aqueous solution, Langmuir, 28 (2011) 168-177.
 A.C.S. Neves, A.J.M. Valente, H.D. Burrows, A.C.F. Ribeiro, V.M.M. Lobo, Effect of terbium(III) chloride on the micellization properties of sodium decyl- and dodecyl-sulfate solutions, Journal of Colloid and Interface Science, 306 (2007) 166-174.
 R.F.P., Pereira, A.J.M. Valente, H.D. Burrows, Thermodynamic analysis of the interaction between trivalent metal ions and sodium dodecyl sulfate: An electrical conductance study, Journal of Molecular Liquids, 156 (2010) 109-114.
 R.F.P. Pereira, A.J.M. Valente, H.D. Burrows, The interaction of long chain sodium carboxylates and sodium dodecylsulfate with lead(II) ions in aqueous solutions, Journal of Colloid and Interface Science, 414 (2014) 66-72.
 R.F.P. Pereira, A.J.M. Valente, H.D. Burrows, M.L. Ramos, A.C.F. Ribeiro, V.M.M. Lobo, Flocculation and micellization of sodium dodecyl sulfate solutions in the presence of aluminium nitrate: effect of concentration and temperature, Acta Chimica Slovenica, 56 (1) (2009) 45-52.
 R.F.P. Pereira, A.J.M. Valente, M. Fernandes, H.D. Burrows, What drives the precipitation of long-chain calcium carboxylates (soaps) in aqueous solution?, Physical Chemistry Chemical Physics, 14 (2012) 7517–7527.
 C.M.R. Almeida, B.F.O. Nascimento, M. Pineiro, A.J.M. Valente, Thermodynamic study of the interaction between5,10,15,20-tetrakis-(N-methyl-4-pyridyl) porphyrin tetraiodine andsodium dodecyl sulfate, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 480 (2015) 279-286.
 I.B. Scorzelli, A.L. Fragomeni, M.L. Torem, Removal of cadmium from a liquid effl uent by ion fl otation, Minerals Engineering, 12 (1999) 905–917.