1. Spectral properties of Schrödinger operators and scattering theory;Agmon;Ann. Sc. Norm. Super. Pisa (IV),1975
2. C0-Groups, Commutator Methods and Spectral Theory for N-Body Hamiltonians;Amrein,1996
3. Direct and Inverse Scattering on the Line;Beals,1988
4. Sur les équations intégrales singulières à noyau réel et symétrique;Carleman,1923
5. Theory of Ordinary Differential Equations;Coddington,1955