@Article{Adams-00a,
  author =   {Adams, Mark ~F.},
  title =   {Evaluation of Three Unstructured Multigrid Methods on 3{D} Finite Element Problems in Solid Mechanics},
  journal =   {International Journal for Numerical Methods in Engineering},
  year =   {2002},
  volume = {55},
  number = {5}.
  pages = {519-534}
}