1. Lower bounds to eigenvalues using operator decompositions of the form B*B
2. Études des Spectres des Équations aux Dérivées Partielles de la Théorie des Plaques Élastiques, (Mémorial des Sciences Mathématiques, fascicule No. 88) Paris, 1937, Gauthier-Villars.
3. Approximation Methods for Eigenvalues of Completely Continuous Symmetric Operators, Proceedings of the Symposium on Spectral Theory and Differential Problems, Oklahoma Agricultural and Mechanical College, 1951, pp. 179–202.
4. Variational Methods for Eigenvalue Problems, Toronto, 1957, University of Toronto Press.