@Article{JCM-12-1, author = {Yu, Xi-Jun}, title = {The Multigrid Method of Nonconforming Finite Elements for Solving the Biharmonic Equation}, journal = {Journal of Computational Mathematics}, year = {1994}, volume = {12}, number = {1}, pages = {61--70}, abstract = {
An optimal order of the multigrid method is given in energy-norm for the nonconforming finite element for solving the biharmonic equation, by using the nodal interpolation operator as the transfer operator between grids.