@article{MM2_1987__58_155212,
     author = {Giovanni Mancini and Roberta Musina},
     title = {A free boundary problem involving limiting {Sobolev} exponents.},
     journal = {Manuscripta mathematica},
     pages = {77--94},
     publisher = {mathdoc},
     volume = {58},
     year = {1987},
     zbl = {0601.49004},
     url = {http://geodesic.mathdoc.fr/item/MM2_1987__58_155212/}
}