1. Three particle systems and unstable particles;Lovelace,1963
2. A class of analytic perturbations for one-body Schrödinger Hamiltonians
3. Spectral properties of many-body Schrödinger operators with dilatation-analytic interactions
4. B. Simon, Resonances in N-body quantum systems with dilatation analytic potentials, and the foundations of time-dependent perturbation theory, to be published.
5. See, however, F. Coester and L. Schlessinger, Unstable states produced in multiparticle reactions, to be published in Ann. Phys.