1. For a summary, see: A. Martin — Invited talk at the International Congress of Mathematicians, Vancouver (1974), to be published by the American Mathematical Society.
2. T. Kinoshita and A. Martin — Unpublished.
3. V. Glaser — Private communication, unpublished.
4. H. Cornille and A. Martin — Nuclear Phys. B49, 413 (1972).
5. H. Cornille and A. Martin — Nuclear Phys. B77, 141 (1974).