Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Urbino (Pesaro), Italy, July 2-12, 1962

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, May 21.30, 1957

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Erice (Trapani), Italy, June 27-July 7, 1971

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, August 21-29, 1964

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, September 3-12, 1956

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, June 25-July 5, 1963

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, August 31-September 8, 1964

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Stresa (Varese), Italy, August 26-September 3, 1968

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Perugia, Italy, September 7-16, 1964

Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Cortona (Arezzo), Italy, June 18-30, 1979