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@article{MAN_1969__181_161835, author = {J. PEETRE and J. L\"OFSTR\"OM}, title = {Approximation {Theorems} {Connected} with {Generalized} {Translations.}}, journal = {Mathematische Annalen}, pages = {255--268}, publisher = {mathdoc}, volume = {181}, year = {1969}, zbl = {0165.14402}, url = {http://geodesic.mathdoc.fr/item/MAN_1969__181_161835/} }
J. PEETRE; J. LÖFSTRÖM. Approximation Theorems Connected with Generalized Translations.. Mathematische Annalen, Tome 181 (1969), pp. 255-268. http://geodesic.mathdoc.fr/item/MAN_1969__181_161835/