1. Ellis, G. F. R., King, A. R.: Was the big bang a whimper? Preprint, Cambridge (1973)
2. Hawking, S. W., Ellis, G. F. R.: The large scale structure of space-time. Cambridge University Press (1973)
3. Clarke, C. J. S.: Local extensions in singular space-times. Preprint, Cambridge (1972)
4. Schmidt, B. G., Ellis, G. F. R.: Unpublished
5. Ehlers, J.: In: Royaumont Conference Volume (1959)