1. R. P. Feynman, Rev. Mod. Phys. 20, 368 (1948).
2. E. Nelson, J. Math. Phys. 5, 332 (1964).
3. K. Itô, “Proceedings of the Fifth Berkeley Symposium on Mathematical Statistics and Probability,” 145 (1966).
4. T. Hida, “Causal Analysis in terms of White Noise,” talk given at the conference “Bielefeld Encounters in Physics and Mathematics II,” December, 1978.
5. L. Streit, in this volume.