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@article{MZ_1996__221_1_174842, author = {D.E. Edmunds and A.A. Ilyn}, title = {Approximation numbers of embeddings of {Sobolev} spaces.}, journal = {Mathematische Zeitschrift}, pages = {177--188}, publisher = {mathdoc}, volume = {221}, number = {1}, year = {1996}, url = {http://geodesic.mathdoc.fr/item/MZ_1996__221_1_174842/} }
D.E. Edmunds; A.A. Ilyn. Approximation numbers of embeddings of Sobolev spaces.. Mathematische Zeitschrift, Tome 221 (1996) no. 1, pp. 177-188. http://geodesic.mathdoc.fr/item/MZ_1996__221_1_174842/