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3. Methods of enzymatic analysis, 3rd ed., vol. 5, enzymes 3: Peptidases, proteinases and their inhibitors;Bergmeyer,1984
4. Biochemische und quantitativ-histochemische Untersuchungen von Proteasen in der Gl. submandibularis von Ratten;Blenk;Acta histochemica, Suppl.,1981
5. Biochemische Arbeitsmethoden;Cooper,1981