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OCR-text (abbyy)
+Lefschetz, S(olomon)
Se: ^ojiti^ibuti^na to the theory of nonlinear
oscillations... 8:o 1956-5?.	^^^^
=S.tudj^es_, Annals of mathematics. Nr 20, 29, 36,
41 '
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OCR-text (abbyy-crop)
+Lefschetz, S(olomon)
Se: Contributions to the theory of nonlinear
oscillations... 8:o 1956-58. Mtalky '
=Studies, Annals of mathematics. Nr 20, 29, 36,
41
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