Lefsehetz, Solomon. "IV. Notes on Differential Equations".
Contributions to the Theory of Nonlinear Oscillations (AM-29), Volume II, Princeton: Princeton University Press, 1953, pp. 61-74.
https://doi.org/10.1515/9781400882700-005
Lefsehetz, S. (1953). IV. Notes on Differential Equations. In
Contributions to the Theory of Nonlinear Oscillations (AM-29), Volume II (pp. 61-74). Princeton: Princeton University Press.
https://doi.org/10.1515/9781400882700-005
Lefsehetz, S. 1953. IV. Notes on Differential Equations.
Contributions to the Theory of Nonlinear Oscillations (AM-29), Volume II. Princeton: Princeton University Press, pp. 61-74.
https://doi.org/10.1515/9781400882700-005
Lefsehetz, Solomon. "IV. Notes on Differential Equations" In
Contributions to the Theory of Nonlinear Oscillations (AM-29), Volume II, 61-74. Princeton: Princeton University Press, 1953.
https://doi.org/10.1515/9781400882700-005
Lefsehetz S. IV. Notes on Differential Equations. In:
Contributions to the Theory of Nonlinear Oscillations (AM-29), Volume II. Princeton: Princeton University Press; 1953. p.61-74.
https://doi.org/10.1515/9781400882700-005
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