1. in Isoelectric Focusing, Ed. (Academic Press, New York, London, 1976), p. 13.
2. Isoelectric Focussing: Theory, Methodology and Applications (Elsevier Biomedical, Amsterdam, 1983).
3. and in Electrokineric Separation Methods, and Eds. (Elsevier, North-Holland, Amsterdam, 1979).
4. Über fokussierenden Ionenaustausch IV. Zur Theorie des Fokussierungseffektes
5. and in Advances in Electrophoresis, Vol. 2, and Eds. (VCH Verlagsgesellschaft, Weinheim, 1988), p. 47.