Bjelke, J., Christensen, J., Nielsen, P., Branner, S., Kanstrup, A., Wagtmann, N., & Rasmussen, H. (2006). Dipeptidyl peptidases 8 and 9: Specificity and molecular characterization compared with dipeptidyl peptidase IV. Portland Press Ltd.

Bjelke, Jais R., Jesper Christensen, Per F Nielsen, Sven Branner, Anders B Kanstrup, Nicolai Wagtmann, ja Hanne B Rasmussen. Dipeptidyl Peptidases 8 and 9: Specificity and Molecular Characterization Compared With Dipeptidyl Peptidase IV. Portland Press Ltd, 2006.

Bjelke, Jais R., et al. Dipeptidyl Peptidases 8 and 9: Specificity and Molecular Characterization Compared With Dipeptidyl Peptidase IV. Portland Press Ltd, 2006.