V. Mutt and J.E. Jorpes, Eur. J. Biochem., 6, 156 (1968). (Original; Partial Structure)

V. Mutt and J.E. Jorpes, Biochem. J., 125, 57P (1971). (Original)

Y. Kurano, T. Kimura, and S. Sakakibara, J. Chem. Soc. Chem. Commun., 5, 323 (1987). (Chem. Synthesis)

J.E. Jorpes and V. Mutt (eds.) Secretin, Cholecystokinin, Pancreozymin and Gastrin, Handbook of Experimental Pharmacology, Vol. 34, Springer-Verlag, Berlin, 1973. (Review)