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| 245 | _aContributions to the theory of nonlinear oscillations 3 vols. | ||
| 440 | _aAnnals of mathematics | ||
| 500 | _aB7:5,11 J0-1 -J0-4 | ||
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| 080 | _a534.01 CON | ||
| 080 | _a534.01 CON | ||
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