1. Bros, J., Iagolnitzer, D.: Structure of scattering functions atm-particle thresholds in a simplified theory and nonholonomic character of theS-matrix and Green's functions, CEN Saclay D Ph T 82-13. A preliminary version of this work, including some results of the present paper and of [3] has been given in Bros, J., Iagolnitzer, D., Pesenti, D.: Nonholonomic singularities of theS-matrix and Green's functions, CEN Saclay DPhT preprint 81/8 (Feb. 1981)
2. Iagolnitzer, D.: Irreducible kernels and non perturbative expansions in a theory with purem?m interaction, CEN Saclay DPhT preprint 82-42
3. Sato, M.: Recent developments in hyperfunction theory and its application to physics. In: Lecture Notes in Physics, Vol. 39, pp. 13?29. Berlin, Heidelberg, New York: Springer 1975
4. Bros, J., Pesenti, D.: Fredholm resolvents of meromorphic kernels with complex parameters: A Landau singularity and the associated equations of typeU in a nonholonomic case. Paris-Sud, Dept. of Mathematics (preprint)
5. Morse, M., Cairns, S.S.: Critical point theory in global analysis and differential geometry. New York, London: Academic Press 1969