1. Solvable Models in Quantum Mechanics;Albeverio,1988
2. Singular Perturbations of Differential Operators;Albeverio,2000
3. The Birman–Kreı˘n–Vishik theory of self-adjoint extensions of semi-bounded operators;Alonso;J. Operator Theory,1980
4. Wave equations with point interactions in finite energy spaces;Bertini;J. Math. Phys.,2001
5. M. Bertini, D. Noja, A. Posilicano, Rigorous dynamics and radiation theory for a Pauli–Fierz model in the ultraviolet limit, preprint, 2004, available at arXiv.org/abs/math-ph/0407002