Convexity estimates for nonlinear elliptic equations and application to free boundary problems
Annales de l'I.H.P. Analyse non linéaire, Tome 19 (2002) no. 6, pp. 903-926. 
@article{AIHPC_2002__19_6_903_0,
     author = {Dolbeault, Jean and Monneau, R\'egis},
     title = {Convexity estimates for nonlinear elliptic equations and application to free boundary problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {903--926},
     publisher = {Elsevier},
     volume = {19},
     number = {6},
     year = {2002},
     mrnumber = {1939090},
     zbl = {1034.35047},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_2002__19_6_903_0/}
}
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Dolbeault, Jean; Monneau, Régis. Convexity estimates for nonlinear elliptic equations and application to free boundary problems. Annales de l'I.H.P. Analyse non linéaire, Tome 19 (2002) no. 6, pp. 903-926. http://www.numdam.org/item/AIHPC_2002__19_6_903_0/

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