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@article{MZ_1976__151_172429, author = {Jens Fromm}, title = {L1-Approximation to {Zero.}}, journal = {Mathematische Zeitschrift}, pages = {31--34}, publisher = {mathdoc}, volume = {151}, year = {1976}, zbl = {0319.41029}, url = {http://geodesic.mathdoc.fr/item/MZ_1976__151_172429/} }
Jens Fromm. L1-Approximation to Zero.. Mathematische Zeitschrift, Tome 151 (1976), pp. 31-34. http://geodesic.mathdoc.fr/item/MZ_1976__151_172429/