1. S. L. S. Drop, A. Brinkman, D. J. Kortleve, C. A. H. Groffen, A. Schuller, and E. C. Zwarthoff, in “Modern Concepts of Insulin-Like Growth Factors,” ed. by E. M. Spencer, Elsevier, New York, Amsterdam, London, Tokyo, 1991, pp. 311–328.
2. S. Shimasaki, M. Shimonaka, H.P. Zhang, and N. Ling, in “Modern Concepts of Insulin-Like Growth Factors,” ed. by E. M. Spencer, Elsevier, New York, Amsterdam, London, Tokyo, 1991, pp. 343–358.