@article{02246269,
title = {Necessary and sufficient condition for compactness of the embedding operator.},
journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
volume = {6},
year = {2005},
zbl = {1088.46013},
language = {en},
url = {http://dml.mathdoc.fr/item/02246269}
}
Ramm, Alexander G. Necessary and sufficient condition for compactness of the embedding operator.. JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 6 (2005) . http://gdmltest.u-ga.fr/item/02246269/