1. Albertsson P.-Å. (1986) Partition of Cell Particles and Macromolecules, 3rd ed., Wiley, New York.
2. Walter H. and Johansson G., eds. (1974) Methods in Enzymology, vol. 228, Aqueous Two-Phase Systems, Academic San Diego, CA.
3. Johansson G. (1974) Partition of proteins and micro-organisms in aqueous biphasic systems. Mol. Cell. Biochem. 4, 169–180.
4. Johansson G., Hartman A., and Albertsson P.-Å. (1973) Partition of proteins in two-phase systems containing charged poly(ethylene glycol). Eur. J. Biochem. 33, 379–386.
5. Johansson G. (1994) Uses of poly(ethylene glycol) with charged or hydrophobic groups, in Methods in Enzymology, vol. 228, Aqueous Two-Phase Systems (Walter H. and Johansson G., eds.) Academic San Diego, CA, pp. 64–74.