G. Vigh and B. Gas. Evolution of the theoretical description of the isoelectric focusing experiment: III. Carrier ampholyte behavior in transient, bidirectional isotachophoresis. Electrophoresis, volume 44, issue 78, 2023. G. Vigh and B. Gas. Evolution of the theoretical description of the isoelectric focusing experiment: I. The path from Svensson's steady-state model to the current two-stage model of isoelectric focusing. ELECTROPHORESIS, volume 44, issue 78, 2023.