1. Agerkvist, I. and Eriksson, L. B. (1993), Dispersion Sci. Tech., 14, 269 - 293.
2. Baran, A. A., (1988), Colloids and Surfaces, 31, 259 - 264.
3. Beker, M. J., Jalinska, A., Blumbergs, J. E., Bekere, I. K., Rapoport, A. I., Ventina, E. J., Polskaya, I. V. and Timoshin, A. A., (1988), 2, 156 ? 159.
4. Brown, M. J., and Lester, J. N., (1980), Appl. Environ. Microbiol., 40, 179 - 185
5. Eriksson, L. B. and H�rdin, A-M., (1987), In: Flocculation in Biotechnology and Separation Systems, ( Elsevier: Amsterdam), pp. 411 - 455.