@Article{ PalPis13, author = { Palatucci, Giampiero and Pisante, Adriano }, title = { Improved Sobolev embeddings, profile decomposition, and concentration-compactness for fractional Sobolev spaces }, journal = { Calc. Var. Partial Differential Equations }, year = { 2014 }, doi = { 10.1007/s00526-013-0656-y }, volume = { 50 }, number = { 3-4 }, pages = { 799-829 }, URL = { http://cvgmt.sns.it/paper/2103/ }, note = { cvgmt preprint} }