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@article{MAN_1970__184_161906, author = {G. PANTELIDIS}, title = {Approximationstheorie f\"ur metrische lineare {R\"aume.}}, journal = {Mathematische Annalen}, pages = {30--48}, publisher = {mathdoc}, volume = {184}, year = {1970}, zbl = {0175.42001}, url = {http://geodesic.mathdoc.fr/item/MAN_1970__184_161906/} }
G. PANTELIDIS. Approximationstheorie für metrische lineare Räume.. Mathematische Annalen, Tome 184 (1970), pp. 30-48. http://geodesic.mathdoc.fr/item/MAN_1970__184_161906/