1. Steiner, D. F., Cunningham, D., Spigelman, L., Aten, B.: Insulin biosynthesis ? Evidence for a precursor. Science157, 697?700 (1967)
2. Rubenstein, A. H., Melani, F., Steiner, D. F.: Circulating proinsulin: immunology, measurement, and biological activity. In: Handbook of physiology, endocrinology. I. Steiner D. F., Freinkel N. (Eds.), pp 515?528. Baltimore: Williams and Wilkins 1972
3. Melani, F., Rubenstein, A.H., Oyer, P.E., Steiner, D.F.: Identification of proinsulin and C-peptide in human serum by a specific immunoassay. Proc. Natl. Acad. Sci. USA67, 148?155 (1970)
4. Kitabchi, A. E., Duckworth, W. C., Brush, J. S., Heinemann, M.: Direct measurement of proinsulin in human plasma by the use of an insulin-degrading enzyme. J. Clin. Invest.50, 1792?1799 (1971)
5. Starr, J. I., Juhn, D.D., Rubenstein, A. H., Kitabchi, A.E.: Degradation of insulin in serum by insulin specific protease. J. Lab. Clin. Med.86, 631?637 (1975)