Geodesic
Perturbation theory in the neighborhood of extended objects
Teoretičeskaâ i matematičeskaâ fizika, Tome 123 (2000) no. 3, pp. 433-451

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Using a unitary mapping to the “action–angle” variables, we formulate the perturbation theory with respect to the inverse coupling constant in the neighborhood of a nontrivial critical point of the action. We also describe the standard perturbation theory in this neighborhood. 
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     author = {I. D. Mandzhavidze and A. N. Sisakyan},
     title = {Perturbation theory in the neighborhood of extended objects},
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I. D. Mandzhavidze; A. N. Sisakyan. Perturbation theory in the neighborhood of extended objects. Teoretičeskaâ i matematičeskaâ fizika, Tome 123 (2000) no. 3, pp. 433-451. http://geodesic.mathdoc.fr/item/TMF_2000_123_3_a5/