Geodesic
Criterion for the compactness of a class of functions of $W_m^l$ ($1$)
Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 733-741 
S. F. Morozov; V. I. Sumin. Criterion for the compactness of a class of functions of $W_m^l$ ($1
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     author = {S. F. Morozov and V. I. Sumin},
     title = {Criterion for the compactness of a class of functions of $W_m^l$ ($1<ml\leqslant n$)},
     journal = {Matemati\v{c}eskie zametki},
     pages = {733--741},
     year = {1970},
     volume = {7},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a9/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A criterion is established for the compactness of a class of functions $u(x)\in W_m^l(\Omega)$ ($1) generalizing Morrey's criterion.