1. On the spectral theory of elliptic differential operators. I;Browder;Math. Ann.,1961
2. On non-linear wave equations;Browder;Math. Zeitschr.,1962
3. Non-linear equations of evolution;Browder;Ann. of Math.,1964
4. Goldstein, J. A., Semi-groups and second order differential equations. To appear.
5. Product formulas for perturbations of linear propagators;Faris;J. Func. Anal.,1967