3. Krause I. , Berner I. , Klostermeyer H.: Sensitive detection of cow milk in ewe and goal milk and cheese by carrier ampholyte - and carrier ampholyte/immobilized pH gradient - isoelectric focusing of γ-caseins using plasmin as signal amplifier, Electrophoresis-Forum '89 (B. J. Radola, ed.) blz. 389-393, Bode-Verlag, München (1989).
3. Krause I. , Berner I, Klostermeyer H.: Sensitive detection of cow milk in ewe and goat milk and cheese by carrier ampholyte - and carrier ampholyte/immobilized pH gradient - isoelectric focusing of γ-caseins using plasmin as signal amplifier. in: Electrophoresis-Forum 89 (B. J. Radola, ed.) pp 389-393, Bode-Verlag, München (1989).