1. Atkinson, D., Frederiksen, J.S.: Commun. math. Phys.40, 55 (1975)
2. Frederiksen, J.S., Commun. Math. Phys.43, 1 (1975)
3. Frederiksen, J.S., Johnson, P.W., Warnock, R.L.: J. Math. Phys.16, 1886 (1975)
4. Preliminary reports on this work are contained in Atkinson, D.: A crossing symmetric, unitary Regge representation, Proceedings of Les Houches Summer School (June 1975);
5. Johnson, P.W.: Construction of Regge amplitudes through solution ofS-Matrix equations, presented at Etudes interdisciplinaires des problèmes inverses à Montpellier (October 1975)