@Article{ mar09, author = { Martinazzi, Luca }, title = { A threshold phenomenon for embeddings of $H^m_0$ into Orlicz spaces }, journal = { Calc. Var. Partial Differential Equations }, year = { 2009 }, volume = { 36 }, pages = { 493-506 }, URL = { http://cvgmt.sns.it/paper/1547/ }, note = { cvgmt preprint} }