Geodesic
Research of stability for extremal rotation surfaces
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 7 (2007) no. 2, pp. 25-32.

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In this work we obtain the first and second variations of area type functional for rotation surfaces formulas. We proof the feature of stability and instability in the terms of the local coordinates and special integrals. We consider some examples by application our results for research if stability for rotation surfaces. 
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N. M. Medvedeva. Research of stability for extremal rotation surfaces. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 7 (2007) no. 2, pp. 25-32. http://geodesic.mathdoc.fr/item/ISU_2007_7_2_a5/

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