1. Milton, R. C. de L., Milton, S. C. F. and Adams, P. A., J. Am. Chem. Soc, 112 (1990) 6039.
2. Hendrix, J. C., Halverson, K. J., Jarrett, J. T. and Lansbury Jr., P. T., J. Org. Chem., 55 (1990) 4517.
3. Willisch, H., Ph D. Thesis, Universitübingen, 1991.
4. Gausepohl, H., Ph D. Thesis, Universität Tübingen, 1990.
5. Mutter, M., Altmann, K.-H., Bellof, D., Flörsheimer, A., Herbert, J., Huber, M., Klein, B., Strauch, L. and Vorherr, T., In Deber, CM., Hruby, V. J. and Kopple, K. D. (Eds.) Peptides: Structure and function, Pierce Chemical Co., Rockford IL, 1986, p. 397.