In this paper, we derive an explicit form in terms of
end-point data in space-time for the classical action, i.e. integration of the Lagrangian
along an extremal, for the nonlinear quartic oscillator evaluated on extremals.
Cite this paper
R. Anderson, "Integration of the Classical Action for the Quartic Oscillator in 1 + 1 Dimensions," Applied Mathematics, Vol. 4 No. 10, 2013, pp. 117-122. doi: 10.4236/am.2013.410A3014.
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 R. L. Anderson, “Actions for a Hierarchy of Attractive Nonlinear Oscillators Including the Quartic Oscillator in 1 + 1 Dimensions,” arXiv.org:1204.0768.