Concerning the $\nu/N \to {1/3}$ resonance, III : use of the Moser method to estimate the rotation number, as a function of amplitude, for the equation $\frac {d^{2}v}{dt^{2}}+ {(\frac {2\nu}{N})}^{2}v + \frac{1}{2} (\sin2t) v^{2}=0$

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