1. Zaneveld. L.J.D., Polakoski. K.L., Robertson, R.T., Williams, W.L.: In: Fritz, H., Tschesche. H. (Eds.): Proceedings of the International Research Conference on Protei-nase Inhibitors, p.236. Berlin-New York: Walter de Gruyter 1971.
2. Schumacher, G.F.B., Swartwout. J.R.. Zlspan, F.P.: In: FRITZ, H., TSCHESCHE. H. (Eds.): Proceedings of the International Research Conference on Proteinase Inhibitors, p. 247. Berlin-New York: Walter de Gruyter 1971.
3. Gaddlm-Rosse. P.. Blandau. R.J.: Amer. J. Anat. 134. 133 (1972).
4. Pew. A.. Glfdhill. B.L., Darzynkiewicz. Z.: J. Histochem. Cytochem. 20. 499 (1972).
5. Yanagimachl, R., Teichman, R.J.: Biol. Reprod. 6, 87 (1972).