1. Baker, G.A., Wang, J., Fan, M., and Weatherley, L.R., Chem. Eng. J., 2009, vol. 1, p. 147.
2. US Patent no. 6824599, 2002.
3. Keskin, S., Kayrak-Talay, D., Akman, U., and Hortacsu, O., J. Supercrit. Fluids, 2007, vol. 43, p. 150.
4. US Patent no. 20080146849 A1, 2008.
5. US Patent no. 20060189499 A1, 2006.