Geodesic
An $O(n)$ invariant rank 1 convex function that is not polyconvex
Theoretical and applied mechanics, 28-29 (2002) no. 1.

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

An $O(n)$ invariant nonnegative rank 1 convex function of linear growth is given that is not polyconvex. This answers a recent question [8, p.182] and [5]. The polyconvex hull of the function is calculated explicitly if $n=2$. 
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     author = {M. \v{S}ilhav\'y},
     title = {An $O(n)$ invariant rank 1 convex function that is not polyconvex},
     journal = {Theoretical and applied mechanics},
     pages = {325 - 336},
     publisher = {mathdoc},
     volume = {28-29},
     number = {1},
     year = {2002},
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M. Šilhavý. An $O(n)$ invariant rank 1 convex function that is not polyconvex. Theoretical and applied mechanics, 28-29 (2002) no. 1. http://geodesic.mathdoc.fr/item/TAM_2002_28-29_1_a16/