The Sobolev embeddings are usually sharp.
Fraysse, A. ; Jaffard, S.
Abstract and Applied Analysis, Tome 2005 (2005), p. 437-448 / Harvested from The Electronic Library of Mathematics
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Publié le : 2005-01-01
DOI : https://doi.org/10.1155/AAA.2005.437
EUDML-ID : urn:eudml:doc:55226 
@article{05038292,
     title = {The Sobolev embeddings are usually sharp.},
     journal = {Abstract and Applied Analysis},
     volume = {2005},
     year = {2005},
     pages = {437-448},
     doi = {10.1155/AAA.2005.437},
     zbl = {1158.46023},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05038292}
}

Fraysse, A.; Jaffard, S. The Sobolev embeddings are usually sharp.. Abstract and Applied Analysis, Tome 2005 (2005) pp. 437-448. doi : 10.1155/AAA.2005.437. http://gdmltest.u-ga.fr/item/05038292/