no. 4
Radially symmetric solutions of a class of problems of the calculus of variations without convexity assumptions
Annales de l'I.H.P. Analyse non linéaire, Tome 9 (1992) no. 4, pp. 465-477 
@article{AIHPC_1992__9_4_465_0,
     author = {Cellina, Arrigo and Flores, Fabi\'an},
     title = {Radially symmetric solutions of a class of problems of the calculus of variations without convexity assumptions},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {465--477},
     year = {1992},
     publisher = {Gauthier-Villars},
     volume = {9},
     number = {4},
     mrnumber = {1186686},
     zbl = {0757.49008},
     language = {en},
     url = {https://www.numdam.org/item/AIHPC_1992__9_4_465_0/}
}
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Cellina, Arrigo; Flores, Fabián. Radially symmetric solutions of a class of problems of the calculus of variations without convexity assumptions. Annales de l'I.H.P. Analyse non linéaire, Tome 9 (1992) no. 4, pp. 465-477. https://www.numdam.org/item/AIHPC_1992__9_4_465_0/

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