Hyperbolicity Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Cortona (Arezzo), Italy, June 24 - July 2, 1976

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Microlocal Analysis and Applications Lectures given at the 2nd Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held at Montecatini Terme, Italy, July 3-11, 1989

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Numerical Analysis of Partial Differential Equations Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Ispra (Varese), Italy, July 3-11, 1967

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Equazioni differenziali astratte Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, May 30-June 8, 1963

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Boundary Value Problems for Linear Evolution Partial Differential Equations Proceedings of the NATO Advanced Study Institute held in Liège, Belgium, September 6–17, 1976

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Problems in Non-Linear Analysis Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, August 20-29, 1970

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Spectral Analysis Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, August 24-September 2, 1973

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Geometrical Optics and Related Topics

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Pseudodifferential Operators with Applications Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Bressanone (Bolzano), Italy, June 16-24, 1977