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Lymbery, Maria; Margenov, Svetozar Robust semi-coarsening multilevel preconditioning of biquadratic FEM systems. (English) Zbl 1245.65158 Cent. Eur. J. Math. 10, No. 1, 357-369 (2012). MSC: 65N30 65F08 35J25 65N55 65N50 PDFBibTeX XMLCite \textit{M. Lymbery} and \textit{S. Margenov}, Cent. Eur. J. Math. 10, No. 1, 357--369 (2012; Zbl 1245.65158) Full Text: DOI