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*Frontmatter, pg. i*Contents, pg. v*Preface, pg. vii*Spectral Analysis of Singularities, pg. 1*Fourier Integral Operators with Complex Phase Functions, pg. 51*Hypoelliptic Operators with Double Characteristics, pg. 65*Differential Boundary Value Problems of Principal Type, pg. 81*Propagation of Singularities for a Class of Operators with Double Characteristics, pg. 113*Subelliptic Operators, pg. 127*Lacunas and Transmissions, pg. 209*Some Classical Theorems in Spectral Theory Revisited, pg. 219*Szego's Theorem and a Complete Symbolic Calculus for Pseudo-Differential Operators, pg. 261*Backmatter, pg. 284