Bound states and propagating states for time-dependent hamiltonians Volker Enss, Krešimir Veselić (1983) Annales de l'I.H.P. Physique théorique
Bound states and scattering states for time periodic hamiltonians Kenji Yajima, Hitoshi Kitada (1983) Annales de l'I.H.P. Physique théorique