1. H. Spohn,Commun. Math. Phys.,123, 277 (1989).
2. M. Hübner and H. Spohn, “Spectral properties of the spin-boson Hamiltonian,” Preprint, Ludwig-Maximilians-Universität, München (1994).
3. M. Hübner and H. Spohn, “Atom coupled to photon: a new type ofN-body Schrödinger problem,” Preprint, Ludwig-Maximilians-Universität, München (1994).
4. R. Minlos and H. Spohn, “The two-body problem in radiative decay: the case of one atom and at most two photons,”Advances in Soviet Mathematics (eds. R. Dobrushin, A. Vershik, and M. Shubin), published by American Mathematical Society.
5. D. R. Yafaev,Teor. Mat. Fiz.,37, 48 (1978).