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| 008 | 160616s 000 0 | ||
| 245 | _aContributions to the theory of nonlinear oscillations, v.1-3,5 | ||
| 100 | _aLefschetz, Solomon, Ed. | ||
| 440 | _aAnnals of mathematics, 20,29,36,45 | ||
| 500 | _aB7:5,11 J0-1 | ||
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| 080 | _a534.01 LEF | ||
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