no. 1
Minimizers with topological singularities in two dimensional elasticity
ESAIM: Control, Optimisation and Calculus of Variations, Tome 14 (2008) no. 1, pp. 192-209.

For a class of 2-D elastic energies we show that a radial equilibrium solution is the unique global minimizer in a subclass of all admissible maps. The boundary constraint is a double cover of S 1 ; the minimizer u is C 1 and is such that det∇u vanishes at one point.

DOI : 10.1051/cocv:2007043
Classification : 49K15, 49K20, 49J30, 74B20
Mots clés : nonlinear elasticity, singular minimizer, stability 
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     title = {Minimizers with topological singularities in two dimensional elasticity},
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     pages = {192--209},
     publisher = {EDP-Sciences},
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     number = {1},
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Yan, Xiaodong; Bevan, Jonathan. Minimizers with topological singularities in two dimensional elasticity. ESAIM: Control, Optimisation and Calculus of Variations, Tome 14 (2008) no. 1, pp. 192-209. doi : 10.1051/cocv:2007043. http://www.numdam.org/articles/10.1051/cocv:2007043/

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