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- E-bookLectures on Differential Equations. (AM-14), Volume 14Solomon Lefschetz
- E-bookContributions to the Theory of Nonlinear Oscillations (AM-20), Volume ISolomon Lefschetz
- E-bookContributions to the Theory of Nonlinear Oscillations (AM-36), Volume IIISolomon Lefschetz
- E-bookTopics in Topology. (AM-10), Volume 10Solomon Lefschetz
- E-bookContributions to the Theory of Nonlinear Oscillations (AM-29), Volume IISolomon Lefschetz
- E-bookSerie: Annals of Mathematics StudiesRichard Taylor