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[4] Bruce van Brunt: The calculus of variations. Springer-Verlag New York, Inc., 2004.
[5] Loyal Durand: Stability and oscillations of a soap film : an analytic treatment. Am. J. Phys., 49(4) :334–343, 1981. Résumé.
[6] Eric W. Weisstein: Surface of Revolution. From MathWorld - A Wolfram Web Resource.