1. Brenner, W.I., Engelman, R.M., Williams, C.D., Boyd, A.D. and Reed, G.E., Amer. J. of Surg., May, 1974.
2. Eriksson, J.D., Gillberg, G. and Lagergren, H., J. Biomed. Mate. Res., 1 (1967) 301.
3. Falb, R.D., Grode, G.A., Grotta, H.M., Wright, R.A., Poirier, R.H., Takahashi, M.T. and Leininger, R.I., U.S. Government Reports PB 175 668 (March 30, 1967 ), PB 183 317 (October, 1967), PB 188 108 (October, 1968), and PB 188 111 (October, 1969).
4. Falb, R.D., Grode, G.A., Luttinger, M., Epstein, M.M., Drake, B. and Leininger, R.I., Government Report PB 173 053, (1966).
5. Falb, R.D., Takahashi, M.T., Grode, G.A. and Leininger, R.I., J. Biomed. Mate. Res., 1 (1967) 239.