Media type: E-Article Title: Quasi-interpolation operators based on the trivariate seven-direction C 2 quartic box spline Contributor: Remogna, Sara Published: Springer Science and Business Media LLC, 2011 Published in: BIT Numerical Mathematics, 51 (2011) 3, Seite 757-776 Language: English DOI: 10.1007/s10543-010-0308-y ISSN: 0006-3835; 1572-9125 Origination: Footnote: