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1Livre
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2Livre
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3Livre
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4Livre
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5Academic Press 1963Livre
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6Macmillan cop. 1962Livre
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7par International symposium on differential equations and dynamical systems
Academic Press cop. 1967Livre -
8par International symposium on dynamical systems
Academic Press 1976, cop. 1976Livre -
9par International symposium on dynamical systems
Academic Press 1976, cop. 1976Livre