1. Theorie der linearen Operatoren im Hilbert–Raum;Achieser,1981
2. Solvable Models in Quantum Mechanics;Albeverio,1988
3. Scattering Theory in Quantum Mechanics;Amrein,1977
4. Null-range potentials and M.G. Kreın's formula for generalized resolvents;Adamyan,1986
5. Foundations of the Theory of Linear Operators in Spaces with an Indefinite Metric;Azizov,1986