@article{EJDE_2007__2007__a14,
     author = {Barbosa, Ezequiel R. and Montenegro, Marcos},
     title = {A note on extremal functions for sharp {Sobolev} inequalities},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2007},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a14/}
}