Media type: E-Article Title: n-Term Approximation by Controllable Step Functions Contributor: Richter, Christian imprint: Wiley, 2002 Published in: Mathematische Nachrichten Language: German DOI: 10.1002/1522-2616(200206)239:1<177::aid-mana177>3.0.co;2-8 ISSN: 0025-584X; 1522-2616 Keywords: General Mathematics Origination: Footnote: