1. Types of von Neumann algebras associated with free fields;Araki;Progr. Theoret. Phys.,1964
2. Structure of the algebras of some free systems;Dell'Antonio;Comm. Math. Phys.,1968
3. P. Federbush and B. Gidas, Renormalization of the one-space dimensional Yukawa model by unitary transformations, to appear.
4. Perturbation of spectra in Hilbert space;Friedrichs,1955
5. Boson fields with nonlinear self-interaction in two dimensions;Glimm;Comm. Math. Phys.,1967