Geodesic
An example of a quasiconvex but not polyconvex function
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1987), pp. 3-6

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     author = {O. A. Kruzhalov},
     title = {An example of a quasiconvex but not polyconvex function},
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     number = {6},
     year = {1987},
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     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_6_a0/}
}
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O. A. Kruzhalov. An example of a quasiconvex but not polyconvex function. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1987), pp. 3-6. http://geodesic.mathdoc.fr/item/VMUMM_1987_6_a0/