MathSciNet bibliographic data MR1451319 (98g:65118) 65N55 (65N12) Chen, Zhangxin; Oswald, Peter Multigrid and multilevel methods for nonconforming \$Q\sb 1\$$Q\sb 1$ elements. Math. Comp. 67 (1998), no. 222, 667–693. Article

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