1. Geometrical Methods in the Theory of Ordinary Differential Equations, Springer-Verlag, New York, 1983.
2. and , Non-Linear Harmonic Analysis, Operator Theory, and P. D. E., Beijing Lectures in Harmonic Analysis, ed., Princeton University Press, 1986.
3. Resonance and Long Time Existence for the Quadratically Nonlinear Schrödinger Equation, Doctoral Dissertation, Department of Mathematics, New York University, 1990.
4. Global, small amplitude solutions to nonlinear evolution equations
5. Normal forms and quadratic nonlinear Klein-Gordon equations