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Autovalori e autosoluzioni : lectures given at the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Chieti, Italy, August 1 - 9, 1962
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Integrali singolari e questioni connesse : lectures given at the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, June 10 - 19, 1957
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Linear elliptic differential systems and eigenvalue problems : [Lectures]