A numerical determination of ultra-subharmonic response for the Duffing equation $\ddot x+\alpha x+\beta x^3=f\operatorname {cos}\omega t\ (\alpha >0)^*$
Author:
Morris E. Levenson
Journal:
Quart. Appl. Math. 26 (1968), 456-461
DOI:
https://doi.org/10.1090/qam/99841
MathSciNet review:
QAM99841
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Article copyright:
© Copyright 1968
American Mathematical Society