no. 5
Extremal functions for the anisotropic Sobolev inequalities
Annales de l'I.H.P. Analyse non linéaire, Tome 24 (2007) no. 5, pp. 741-756 
@article{AIHPC_2007__24_5_741_0,
     author = {El Hamidi, A. and Rakotoson, J. M.},
     title = {Extremal functions for the anisotropic {Sobolev} inequalities},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {741--756},
     year = {2007},
     publisher = {Elsevier},
     volume = {24},
     number = {5},
     doi = {10.1016/j.anihpc.2006.06.003},
     mrnumber = {2348050},
     language = {en},
     url = {https://www.numdam.org/articles/10.1016/j.anihpc.2006.06.003/}
}
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El Hamidi, A.; Rakotoson, J. M. Extremal functions for the anisotropic Sobolev inequalities. Annales de l'I.H.P. Analyse non linéaire, Tome 24 (2007) no. 5, pp. 741-756. doi: 10.1016/j.anihpc.2006.06.003

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