1. Heath, W. F., Tarn, J. P. and Merrifield, R. B., Int. J. Pept. Protein Res., 28 (1986) 98.
2. Shechter, Y., Rubinstein, M and Patchornik, A., Biochemistry, 16 (1977) 1424.
3. Grossi, L., Tetrahedron Lett., 28 (1987) 3387.
4. DiMarchi, R. D., Long, H. Epp, J., Schoner, B. and Belagaje, R., In Rivier, J. E. and Marshall, G. R. (Eds.) Peptides: Chemistry, Structure and Biology (Proceedings of the 11th American Peptide Symposium), ESCOM, Leiden, 1990, pp. 99–100.
5. Savige, W. E. and Fontana, A., In Hirs, C. H. W. and Timasheff, S. N. (Eds.), Methods of Enzymology, Vol. 47, Academic Press, New York, 1977, p. 453.