1. Albertsson PA (1971). Partition of cell particles and macromolecules. Almquist and Wilsell, Stockholm, Sweden.
2. Albertsson PA (1985). History of aqueous polymer two-phase partition. In: Walter H, Brooks DE and Fisher D (eds) Academic Press. p.l.
3. Walter H (1977). Partition of cells in two polymer aqueous phases: a surface affinity method for cell separation. In: Catsimpoolas N (ed), Methods of Cell Separation, Vol. 1. Plenum Press, New York pp. 307–354.
4. Treffry TE, Sharp PT, Walter H and Brooks DE (1985). Thin- layer countercurrent distribution and apparatus. In: Walter H, Brooks DE and Fisher D (eds) Partitioning in aqueous two-phase systems. Academic Press, pp. 131–148.
5. Walter H (1982). Separation and subfractionation of blood cell populations based on their surface properties by partitioning in two-polymer aqueous phase systems. In: Pretlow TG and Pretlow T (eds) Cell Separation: Methods and Selected Applications, Academic Press New York. Vol. 1 pp. 261–299.