1. Allgemeine Eigenwerttheorie Hermitescher Funktionaloperatoren
2. Linear Transformations in Hilbert Space and Their Applications to Analysis, Amer. Math. Soc. Colloq. Publ. No. 15, Amer. Math. Soc., New York, 1932.
3. and , On the wave-function renormalization in a simple model, Comm. Pure Appl. Math., this issue.