Schoenberger, O. L., H. Schwöbel and W. Ebert. "N-Acetylalanine Aminopeptidase Activity in Normal and Tumour Cells" Clinical Chemistry and Laboratory Medicine, 24.6 (2009): 375-378. Retrieved 19 May. 2013, from doi:10.1515/cclm.1986.24.6.375

Schoenberger, O., Schwöbel, H. & Ebert, W. (2009). N-Acetylalanine Aminopeptidase Activity in Normal and Tumour Cells. Clinical Chemistry and Laboratory Medicine, 24(6), pp. 361-432. Retrieved 19 May. 2013, from doi:10.1515/cclm.1986.24.6.375

Schoenberger, O. L., H. Schwöbel and W. Ebert. 2009. N-Acetylalanine Aminopeptidase Activity in Normal and Tumour Cells. Clinical Chemistry and Laboratory Medicine. 24(6): 361-432. Retrieved 19 May. 2013, from doi:10.1515/cclm.1986.24.6.375