1. Hartley, B. S., Phil. Trans. R. Soc., B 257, 77–86 (1973).
2. Birktoft, J. J., Blow, D. M., Henderson, R., and Steitz, T. A., Phil. Trans. R. Soc., B 257, 67–76 (1973).
3. Stroud, R. M., Scient. Am., 231, 74–89 (1974).
4. Blow, D. M., and Smith, J. M., Phil. Trans. R. Soc., B 272, 87–98 (1975).
5. Huber, R., Kukla, D., Steigemann, W., Deisenhofer, J., and Jones, A., in Bayer Symposium: Proteinase Inhibitors, (edit. by Fritz. H., et al.) 497–512 (Springer Verlag, Berlin, 1974).