[1] Kentish S. E., Stevens G.W. (2001) ” Innovations in separation technology for the recycling and re-use of liquid waste streams”. Chem. Eng. J., 84, 149.
[2] R.P. Cahn, N.N. Li, (1974) ” Separation of phenol from wastewater by the liquid membrane”. Separation Science and Technology 9 505–519.
[3] Kumar Goyal, N.S Jayakumar, and M.A Hashim (2011) "Chromium removal by emulsion liquid membrane using [BMIM]+[NTf2]- as stabilizer and TOMAC as extractant," Kuala Lumpur.
[4] N.N. Li, US Pat. 3 (1968) 410794.
[5] J.W. Frankenfeld, R.P. Chan, N.N. Li (1981) “Extraction of copper by liquid membranes, Separation Science and Technology”. 16 385–402
[6] T.P. Martin, G.A. Davies (1977) “The extraction of copper from dilute aqueous solutions using a liquid membrane processs”. Hydrometallurgy 2 315–334.
[7] T. Kitagawa, Y. Nishikawa, J. Frankenfeld, N.N. Li (1977) “ Waste water treatment by liquid membrane process” . Environmental Science and Technology 11 ,602–605.
[8] R.P and Li, N.N Cahn (1974) "Separation of phenol from wastewater by liquid mebrane". Separation Science, pp. 505-519,.
[9] J.W. Frankenfeld, N.N. Li (1977) “Wastewater treatment by liquid ion exchange in liquid membrane system”. in: N.N. Li (Ed.), Recent Developments in Separation Science, 3, CRC Press Inc, Cleveland Ohio, , pp. 285–292.
[10] M. Chakraborty, C. Bhattacharya, S. Datta(2010) “Emulsion liquid membranes: definitions and classification, theories, module design, applications new directions and perspectives in: V.S. Kislik (Ed.), Liquid Membranes: Principles and Applications”. in Chemical Separations and Wastewater Treatment, Elsevier, pp. 141–199.
[11] Z. Gu, W.S. Ho, N.N. Li (1992) “Emulsion liquid membrane: design considerations”, in: W.S. Ho, K.K. Sirkar (Eds.), Membrane Handbook, Chapman & Hall, New York, pp. 656–700.
[12] L. Boyadzhiev, Z. Lazarova (1995)“ Liquid membranes (liquid pertraction)”. in: R.D. Noble, S.A. Stern (Eds.), Membrane Separations Technology. Principles and Applications, Elsevier Science B.V., pp. 283–352.
[13] E. S. Matulevicius and N. N. Li(1975) “Facilitated transport through liquid membrane," Sep. Purif. Methods, 4(1): 73-79.
[14] N. N. Li (1980) "Facilitated transport through liquid membrane," Journal of Membrane Science, 3: 265.
[15] N. N. Li (1996) "Encapsulated and Separation by liquid surfactant membrane," Chemical Eng., 370: 325-327,
[16] Norman Li, "Separating hydrocarbons with liquid membrane ," November 12, 1968.
[17] J.P. Canselier, H. Delmas, A.M. Wilhelm, B. Abismail, Ultrasound emulsification – An overview, Journal of Dispersion Science and Technology 23 (2002) 333–349.
[18] N.N. Li, R.P. Chan, D. Naden, R.W.M. Lai (1983) “Liquid membrane processes for copper extraction”. Hydrometallurgy 9 , 277–305.
[19] P.R. Patnaik (1995) “ Liquid emulsion membranes: Principles, problems and applications in fermentation processes”, Biotechnology Advances 13 ,175–208.
[20] B. Sengupta, R. Sengupta, N. Subrahmanyam (2006) ” Copper extraction into emulsion liquid membranes using LIX 984N-C”. Hydrometallurgy 81,67–73
[21] S. Venkatesan, K.M.M.S. Begum (2009) “ Emulsion liquid membrane pertraction of benzimidazole using a room temperature ionic liquid (RTIL) carrier”. Chemical Engineering Journal 148, 254–262.
[22] S. Venkatesan, K.M.M.S. Begum (2009) “Emulsion liquid membrane pertraction of imidazole from dilute aqueous solutions by Aliquat-336 mobile carrier”. Desalination 236 , 65–77.
[23] M.A. Hasan, Y.T. Selima, K.M. Mohamed (2009) “ Removal of chromium from aqueous waste solution using liquid emulsion membrane”. Journal of Hazardous Materials 168, 1537–1541.
[24] M. Chiha, M.H. Samar, O. Hamdaoui (2006) “Extraction of chromium (VI) from sulphuric acid aqueous solutions by a liquid surfactant membrane (LSM)”. Desalination 194, 69–80.
[25] M.S. Gasser, N.E. El-Hefny, J.A. Daoud (2008) “Extraction of Co(II) from aqueous solution using emulsion liquid membrane”. Journal of Hazardous Materials 151, 610–615.
[26] Lifeng Zhao, Dejun Fei, Yagu Dang, Xiaolong Zhou, Jiali Xiao (2010) “Studies on the extraction of chromium(III) by emulsion liquid membrane” , Journal of Hazardous Materials 178 130–135
[27] Y. Wan, X. Zhang (2002) “Swelling determination of W/O/W emulsion liquid membranes”. Journal of Membrane Science 196 , 185–201.
[28] R.A. Kumbasar (2009) “ Cobalt-nickel separation from acidic thiocyanate leach solutions by emulsion liquid membranes (ELMs) using TOPO as carrier”. Separation and Purification Technology 68, 208–215.
[29] Yasser T. Mohamed, Ahmed H. Ibrahim (2012), “Extraction of Copper from Waste Solution Using Liquid Emulsion Membrane “,Journal of Environmental Protection, 3, 129-134. [30] F. Nakashio, M. Goto, M. Matsumoto, J. Irie, K. Kondo, Role of surfactants in the behavior of emulsion liquid membranes – Development of new surfactants, Journal of Membrane Science 38 (1988) 249–260.
[31] M. Alaguraj, K.Palanivelu, M.Velan (2009) “Removal of Cu (II) using emulsion liquid membrane”. International Journal of ChemTech Research CODEN (USA): IJCRGG ISSN : 0974-4290 Vol.1, No.3 , pp 722-726, July-Sept [32] P.S. Kankekar, S.J. Wagh, V.V. Mahajani (2010) “Process intensification in extraction by liquid emulsion membrane (LEM) process: A case study; enrichment of ruthenium from lean aqueous solution”. Chemical Engineering and Processing 49, 441–448
[33] B. Sengupta, M.S. Bhakhar, R. Sengupta (2007) “Extraction of copper from ammoniacal solutions into emulsion liquid membranes using LIX 84 I”. Hydrometallurgy 89 , 311–318
[34] P.S. Kulkarni, S. Mukhopadhyay, M.P. Bellary, S.K. Ghosh (2002) “ Studies on membrane stability and recovery of uranium (VI) from aqueous solutions using a liquid emulsion membrane process”. Hydrometallurgy 64, 49–58
[35] P.S. Kulkarni, V.V. Mahajani (2002) “ Application of liquid emulsion membrane (LEM) process for enrichment of molybdenum from aqueous solutions”. Journal of
Membrane Science 201, 123–135.
[36] R. Sabry, A. Hafez, A. MaalyKhedr, El-Hassanin (2007) ” Removal of lead by an emulsion liquid membrane”. Part I, Desalination 212, 165–175.
[37] H. Matsumiya, T. Kageyama, M. Hiraide (2004) “Multielement preconcentration of trace heavy metals in seawater with an emulsion containing 8-quinolinol for graphite-furnace atomic absorption spectrometry”. Analytica Chimica Acta 507, 205–209.
[38] J.M. Perera, G.W. Stevens (2009) “Use of emulsion liquid membrane systems in chemical and biotechnological separations”. Handbook of Membrane Separations: Chemical, Pharmaceutical, Food, and Biotechnological Applications, CRC Press, pp. 709–739.
[39] P.S. Kulkarni, S. Mukhopadhyay, M.P. Bellary, S.K. Ghosh (2002) ” Studies on membrane stability and recovery of uranium (VI) from aqueous solutions using a liquid emulsion membrane process”. Hydrometallurgy 64, 49–58.
[40] B. Abismail, J.P. Canselier, A.M. Wilhelm, H. Delmas, C. Gourdon (1999) “ Emulsification by ultrasound: drop size distribution and stability”. Ultrasonics Sonochemistry 6 75–83.
[41] N. Othman, H. Mat, M. Goto (2006) “Separation of silver from photographic wastes by emulsion liquid membrane system”. Journal of Membrane Science 282, 171–177.
[42] M.ALAGURAJ*, K.PALANIVELU, M.VELAN(2009) “ Removal of Cu (II) using emulsion liquid membrane”. International Journal of ChemTech Research Vol.1, No.3 , pp 722-726, July-Sept
[43] Bina Sengupta, R. Sengupta, N. Subrahmanyam(2005) “Copper extraction into emulsion liquid membranes using LIX 984N-C” , Chemical Engineering Department, Faculty of Technology and Engineering, The Maharaja Sayajirao University of Baroda , Vadodara, 390 001, Gujarat, India .13 December
[44] M.T.A. Reis, J.M.R. Carvalho (2004) “Modelling of zinc extraction from sulphate solutions with bis(2-ethylhexyl)thiophosphoric acid by emulsion liquid membranes”. Journal of Membrane Science 237, 97–107.
[45] M.ALAGURAJ, K.PALANIVELU, M.VELAN (2009) “Removal of Cu (II) using emulsion liquid membrane”. International Journal of ChemTech Research CODEN (USA): IJCRGG ISSN : 0974-4290 Vol.1, No.3 , pp 722-726, July-Sept
[46] Rania Sabry, Azza Hafez, MaalyKhedra, Adel El (2007) -Hassaninb. “Removal of lead by an emulsion liquid” membrane, a Chemical Engineering and Pilot-Plant Department, National Research Center, Cairo, Egypt Desalination 212 165–175
[47] Yasser T. Mohamed, Ahmed H. Ibrahim (2012), “Extraction of Copper from Waste Solution Using Liquid Emulsion Membrane “,Journal of Environmental Protection, 3, 129-134.